diff --git a/packages/playground/src/shared/dom/Scene.tsx b/packages/playground/src/shared/dom/Scene.tsx
index 0809b8a..428ed52 100644
--- a/packages/playground/src/shared/dom/Scene.tsx
+++ b/packages/playground/src/shared/dom/Scene.tsx
@@ -3,14 +3,27 @@ import type {UseDragOpts} from './useDrag'
 import useDrag from './useDrag'
 import React, {useLayoutEffect, useMemo, useState} from 'react'
 import type {IProject, ISheet} from '@theatre/core'
-import {onChange} from '@theatre/core'
+import {onChange, types} from '@theatre/core'
 import type {IScrub, IStudio} from '@theatre/studio'
 
-studio.initialize()
+studio.initialize({usePersistentStorage: false})
+
+const textInterpolate = (left: string, right: string, progression: number) => {
+  if (!left || right.startsWith(left)) {
+    const length = Math.floor(
+      Math.max(0, (right.length - left.length) * progression),
+    )
+    return left + right.slice(left.length, left.length + length)
+  }
+  return left
+}
 
 const boxObjectConfig = {
-  x: 0,
-  y: 0,
+  test: types.string('Hello?', {interpolate: textInterpolate}),
+  testLiteral: types.stringLiteral('a', {a: 'Option A', b: 'Option B'}),
+  bool: types.boolean(false),
+  x: types.number(200),
+  y: types.number(200),
 }
 
 const Box: React.FC<{
@@ -23,11 +36,17 @@ const Box: React.FC<{
 
   const isSelected = selection.includes(obj)
 
-  const [pos, setPos] = useState<{x: number; y: number}>({x: 0, y: 0})
+  const [state, setState] = useState<{
+    x: number
+    y: number
+    test: string
+    testLiteral: string
+    bool: boolean
+  }>(obj.value)
 
   useLayoutEffect(() => {
     const unsubscribeFromChanges = onChange(obj.props, (newValues) => {
-      setPos(newValues)
+      setState(newValues)
     })
     return unsubscribeFromChanges
   }, [id])
@@ -50,7 +69,13 @@ const Box: React.FC<{
           firstOnDragCalled = true
         }
         scrub!.capture(({set}) => {
-          set(obj.props, {x: x + initial.x, y: y + initial.y})
+          set(obj.props, {
+            x: x + initial.x,
+            y: y + initial.y,
+            test: initial.test,
+            testLiteral: initial.testLiteral,
+            bool: initial.bool,
+          })
         })
       },
       onDragEnd(dragHappened) {
@@ -73,16 +98,20 @@ const Box: React.FC<{
       }}
       ref={setDivRef}
       style={{
-        width: 100,
-        height: 100,
-        background: 'gray',
+        width: 300,
+        height: 300,
+        color: 'white',
         position: 'absolute',
-        left: pos.x + 'px',
-        top: pos.y + 'px',
+        left: state.x + 'px',
+        top: state.y + 'px',
         boxSizing: 'border-box',
-        border: isSelected ? '1px solid #5a92fa' : '1px solid transparent',
+        border: isSelected ? '1px solid #5a92fa' : '1px solid white',
       }}
-    ></div>
+    >
+      <pre style={{margin: 0, padding: '1rem'}}>
+        {JSON.stringify(state, null, 4)}
+      </pre>
+    </div>
   )
 }
 
@@ -109,7 +138,7 @@ export const Scene: React.FC<{project: IProject}> = ({project}) => {
         right: '0',
         top: 0,
         bottom: '0',
-        background: 'black',
+        background: '#333',
       }}
     >
       <button
diff --git a/theatre/core/src/projects/store/types/SheetState_Historic.ts b/theatre/core/src/projects/store/types/SheetState_Historic.ts
index 99cb3be..f436d18 100644
--- a/theatre/core/src/projects/store/types/SheetState_Historic.ts
+++ b/theatre/core/src/projects/store/types/SheetState_Historic.ts
@@ -39,7 +39,7 @@ export type TrackData = BasicKeyframedTrack
 
 export type Keyframe = {
   id: KeyframeId
-  value: number
+  value: unknown
   position: number
   handles: [leftX: number, leftY: number, rightX: number, rightY: number]
   connectedRight: boolean
diff --git a/theatre/core/src/propTypes/index.ts b/theatre/core/src/propTypes/index.ts
index 9879440..dfa8c46 100644
--- a/theatre/core/src/propTypes/index.ts
+++ b/theatre/core/src/propTypes/index.ts
@@ -8,9 +8,9 @@ import type {
 import {sanitizeCompoundProps} from './internals'
 import {propTypeSymbol} from './internals'
 
-const validateCommonOpts = (
+const validateCommonOpts = <T>(
   fnCallSignature: string,
-  opts?: PropTypeConfigOpts,
+  opts?: PropTypeConfigOpts<T>,
 ) => {
   if (process.env.NODE_ENV !== 'production') {
     if (opts === undefined) return
@@ -70,9 +70,10 @@ const validateCommonOpts = (
  */
 export const compound = <Props extends IShorthandCompoundProps>(
   props: Props,
-  opts?: PropTypeConfigOpts,
+  opts?: PropTypeConfigOpts<Props>,
 ): PropTypeConfig_Compound<
-  ShorthandCompoundPropsToLonghandCompoundProps<Props>
+  ShorthandCompoundPropsToLonghandCompoundProps<Props>,
+  Props
 > => {
   validateCommonOpts('t.compound(props, opts)', opts)
   return {
@@ -81,6 +82,9 @@ export const compound = <Props extends IShorthandCompoundProps>(
     valueType: null as $IntentionalAny,
     [propTypeSymbol]: 'TheatrePropType',
     label: opts?.label,
+    sanitize: opts?.sanitize,
+    interpolate: opts?.interpolate,
+    isScalar: false,
   }
 }
 
@@ -131,7 +135,7 @@ export const number = (
     nudgeFn?: PropTypeConfig_Number['nudgeFn']
     range?: PropTypeConfig_Number['range']
     nudgeMultiplier?: number
-  } & PropTypeConfigOpts,
+  } & PropTypeConfigOpts<number>,
 ): PropTypeConfig_Number => {
   if (process.env.NODE_ENV !== 'production') {
     validateCommonOpts('t.number(defaultValue, opts)', opts)
@@ -202,6 +206,15 @@ export const number = (
     nudgeFn: opts?.nudgeFn ?? defaultNumberNudgeFn,
     nudgeMultiplier:
       typeof opts?.nudgeMultiplier === 'number' ? opts.nudgeMultiplier : 1,
+    isScalar: true,
+    sanitize(value) {
+      if (opts?.sanitize) return opts.sanitize(value)
+      return typeof value === 'number' ? value : undefined
+    },
+    interpolate(left, right, progression) {
+      if (opts?.interpolate) return opts.interpolate(left, right, progression)
+      return left + progression * (right - left)
+    },
   }
 }
 
@@ -227,7 +240,7 @@ export const number = (
  */
 export const boolean = (
   defaultValue: boolean,
-  opts?: PropTypeConfigOpts,
+  opts?: PropTypeConfigOpts<boolean>,
 ): PropTypeConfig_Boolean => {
   if (process.env.NODE_ENV !== 'production') {
     validateCommonOpts('t.boolean(defaultValue, opts)', opts)
@@ -245,6 +258,15 @@ export const boolean = (
     valueType: null as $IntentionalAny,
     [propTypeSymbol]: 'TheatrePropType',
     label: opts?.label,
+    isScalar: false,
+    sanitize(value: unknown) {
+      if (opts?.sanitize) return opts.sanitize(value)
+      return typeof value === 'boolean' ? value : undefined
+    },
+    interpolate(left, right, progression) {
+      if (opts?.interpolate) return opts.interpolate(left, right, progression)
+      return left
+    },
   }
 }
 
@@ -271,7 +293,7 @@ export const boolean = (
  */
 export const string = (
   defaultValue: string,
-  opts?: PropTypeConfigOpts,
+  opts?: PropTypeConfigOpts<string>,
 ): PropTypeConfig_String => {
   if (process.env.NODE_ENV !== 'production') {
     validateCommonOpts('t.string(defaultValue, opts)', opts)
@@ -289,6 +311,12 @@ export const string = (
     valueType: null as $IntentionalAny,
     [propTypeSymbol]: 'TheatrePropType',
     label: opts?.label,
+    isScalar: false,
+    sanitize(value: unknown) {
+      if (opts?.sanitize) return opts.sanitize(value)
+      return typeof value === 'string' ? value : undefined
+    },
+    interpolate: opts?.interpolate,
   }
 }
 
@@ -326,7 +354,9 @@ export function stringLiteral<Opts extends {[key in string]: string}>(
   /**
    * opts.as Determines if editor is shown as a menu or a switch. Either 'menu' or 'switch'.  Default: 'menu'
    */
-  opts?: {as?: 'menu' | 'switch'} & PropTypeConfigOpts,
+  opts?: {as?: 'menu' | 'switch'} & PropTypeConfigOpts<
+    Extract<keyof Opts, string>
+  >,
 ): PropTypeConfig_StringLiteral<Extract<keyof Opts, string>> {
   return {
     type: 'stringLiteral',
@@ -336,13 +366,30 @@ export function stringLiteral<Opts extends {[key in string]: string}>(
     valueType: null as $IntentionalAny,
     as: opts?.as ?? 'menu',
     label: opts?.label,
+    isScalar: false,
+    sanitize(value: unknown) {
+      if (opts?.sanitize) return opts.sanitize(value)
+      return typeof value === 'string' && Object.keys(options).includes(value)
+        ? (value as Extract<keyof Opts, string>)
+        : undefined
+    },
+    interpolate(left, right, progression) {
+      if (opts?.interpolate) return opts.interpolate(left, right, progression)
+      return left
+    },
   }
 }
 
-interface IBasePropType<ValueType> {
+export type Sanitizer<T> = (value: unknown) => T | undefined
+export type Interpolator<T> = (left: T, right: T, progression: number) => T
+
+interface IBasePropType<ValueType, PropTypes = ValueType> {
   valueType: ValueType
   [propTypeSymbol]: 'TheatrePropType'
   label: string | undefined
+  isScalar: boolean
+  sanitize?: Sanitizer<PropTypes>
+  interpolate?: Interpolator<PropTypes>
 }
 
 export interface PropTypeConfig_Number extends IBasePropType<number> {
@@ -381,9 +428,18 @@ export interface PropTypeConfig_Boolean extends IBasePropType<boolean> {
   default: boolean
 }
 
-export interface PropTypeConfigOpts {
-  label?: string
+export interface PropTypeConfig_Color<ColorObject>
+  extends IBasePropType<ColorObject> {
+  type: 'color'
+  default: ColorObject
 }
+
+export interface PropTypeConfigOpts<ValueType> {
+  label?: string
+  sanitize?: Sanitizer<ValueType>
+  interpolate?: Interpolator<ValueType>
+}
+
 export interface PropTypeConfig_String extends IBasePropType<string> {
   type: 'string'
   default: string
@@ -400,8 +456,13 @@ export interface PropTypeConfig_StringLiteral<T extends string>
 /**
  *
  */
-export interface PropTypeConfig_Compound<Props extends IValidCompoundProps>
-  extends IBasePropType<{[K in keyof Props]: Props[K]['valueType']}> {
+export interface PropTypeConfig_Compound<
+  Props extends IValidCompoundProps,
+  PropTypes = Props,
+> extends IBasePropType<
+    {[K in keyof Props]: Props[K]['valueType']},
+    PropTypes
+  > {
   type: 'compound'
   props: Record<string, PropTypeConfig>
 }
diff --git a/theatre/core/src/sequences/trackValueAtTime.ts b/theatre/core/src/sequences/trackValueAtTime.ts
index 0a1dbc1..85c880a 100644
--- a/theatre/core/src/sequences/trackValueAtTime.ts
+++ b/theatre/core/src/sequences/trackValueAtTime.ts
@@ -8,10 +8,14 @@ import {ConstantDerivation, prism, val} from '@theatre/dataverse'
 import logger from '@theatre/shared/logger'
 import UnitBezier from 'timing-function/lib/UnitBezier'
 
+export type KeyframeValueAtTime =
+  | {left: unknown; right?: unknown; progression: number}
+  | undefined
+
 export default function trackValueAtTime(
   trackP: Pointer<TrackData | undefined>,
   timeD: IDerivation<number>,
-): IDerivation<unknown> {
+): IDerivation<KeyframeValueAtTime> {
   return prism(() => {
     const track = val(trackP)
     const driverD = prism.memo(
@@ -20,7 +24,7 @@ export default function trackValueAtTime(
         if (!track) {
           return new ConstantDerivation(undefined)
         } else if (track.type === 'BasicKeyframedTrack') {
-          return trackValueAtTime_basicKeyframedTrack(track, timeD)
+          return trackValueAtTime_keyframedTrack(track, timeD)
         } else {
           logger.error(`Track type not yet supported.`)
           return new ConstantDerivation(undefined)
@@ -37,14 +41,15 @@ type IStartedState = {
   started: true
   validFrom: number
   validTo: number
-  der: IDerivation<unknown>
+  der: IDerivation<KeyframeValueAtTime>
 }
+
 type IState = {started: false} | IStartedState
 
-function trackValueAtTime_basicKeyframedTrack(
+function trackValueAtTime_keyframedTrack(
   track: BasicKeyframedTrack,
   timeD: IDerivation<number>,
-): IDerivation<unknown> {
+): IDerivation<KeyframeValueAtTime> {
   return prism(() => {
     let stateRef = prism.ref<IState>('state', {started: false})
     let state = stateRef.current
@@ -52,7 +57,7 @@ function trackValueAtTime_basicKeyframedTrack(
     const time = timeD.getValue()
 
     if (!state.started || time < state.validFrom || state.validTo <= time) {
-      stateRef.current = state = pp(timeD, track)
+      stateRef.current = state = updateState(timeD, track)
     }
 
     return state.der.getValue()
@@ -61,7 +66,7 @@ function trackValueAtTime_basicKeyframedTrack(
 
 const undefinedConstD = new ConstantDerivation(undefined)
 
-const pp = (
+const updateState = (
   progressionD: IDerivation<number>,
   track: BasicKeyframedTrack,
 ): IStartedState => {
@@ -138,7 +143,7 @@ const states = {
       started: true,
       validFrom: -Infinity,
       validTo: kf.position,
-      der: new ConstantDerivation(kf.value),
+      der: new ConstantDerivation({left: kf.value, progression: 0}),
     }
   },
   lastKeyframe(kf: Keyframe): IStartedState {
@@ -146,7 +151,7 @@ const states = {
       started: true,
       validFrom: kf.position,
       validTo: Infinity,
-      der: new ConstantDerivation(kf.value),
+      der: new ConstantDerivation({left: kf.value, progression: 0}),
     }
   },
   between(
@@ -159,7 +164,7 @@ const states = {
         started: true,
         validFrom: left.position,
         validTo: right.position,
-        der: new ConstantDerivation(left.value),
+        der: new ConstantDerivation({left: left.value, progression: 0}),
       }
     }
 
@@ -182,7 +187,11 @@ const states = {
       )
 
       const valueProgression = solver.solveSimple(progression)
-      return left.value + valueProgression * (right.value - left.value)
+      return {
+        left: left.value,
+        right: right.value,
+        progression: valueProgression,
+      }
     })
 
     return {
diff --git a/theatre/core/src/sheetObjects/SheetObject.ts b/theatre/core/src/sheetObjects/SheetObject.ts
index 6d4ed44..3c8de43 100644
--- a/theatre/core/src/sheetObjects/SheetObject.ts
+++ b/theatre/core/src/sheetObjects/SheetObject.ts
@@ -1,3 +1,4 @@
+import type {KeyframeValueAtTime} from '@theatre/core/sequences/trackValueAtTime'
 import trackValueAtTime from '@theatre/core/sequences/trackValueAtTime'
 import type Sheet from '@theatre/core/sheets/Sheet'
 import type {SheetObjectAddress} from '@theatre/shared/utils/addresses'
@@ -21,6 +22,8 @@ import type {
 import {Atom, getPointerParts, pointer, prism, val} from '@theatre/dataverse'
 import type SheetObjectTemplate from './SheetObjectTemplate'
 import TheatreSheetObject from './TheatreSheetObject'
+import {get} from 'lodash-es'
+import type {Interpolator, PropTypeConfig} from '@theatre/core/propTypes'
 
 // type Everything = {
 //   final: SerializableMap
@@ -153,7 +156,32 @@ export default class SheetObject implements IdentityDerivationProvider {
             const derivation = this._trackIdToDerivation(trackId)
 
             const updateSequenceValueFromItsDerivation = () => {
-              valsAtom.setIn(pathToProp, derivation.getValue())
+              const propConfig = get(this.template.config.props, pathToProp) as
+                | PropTypeConfig
+                | undefined
+              const value: KeyframeValueAtTime = derivation.getValue()
+              if (!value) return valsAtom.setIn(pathToProp, value)
+              if (value.right === undefined)
+                return valsAtom.setIn(pathToProp, value.left)
+              if (propConfig?.interpolate) {
+                const interpolate =
+                  propConfig.interpolate as Interpolator<unknown>
+                return valsAtom.setIn(
+                  pathToProp,
+                  interpolate(value.left, value.right, value.progression),
+                )
+              }
+              if (
+                typeof value.left === 'number' &&
+                typeof value.right === 'number'
+              ) {
+                //@Because tests don't provide prop config, and fail if this is omitted.
+                return valsAtom.setIn(
+                  pathToProp,
+                  value.left + value.progression * (value.right - value.left),
+                )
+              }
+              valsAtom.setIn(pathToProp, value.left)
             }
             const untap = derivation
               .changesWithoutValues()
@@ -177,12 +205,11 @@ export default class SheetObject implements IdentityDerivationProvider {
 
   protected _trackIdToDerivation(
     trackId: SequenceTrackId,
-  ): IDerivation<unknown> {
+  ): IDerivation<KeyframeValueAtTime | undefined> {
     const trackP =
       this.template.project.pointers.historic.sheetsById[this.address.sheetId]
         .sequence.tracksByObject[this.address.objectKey].trackData[trackId]
     const timeD = this.sheet.getSequence().positionDerivation
-
     return trackValueAtTime(trackP, timeD)
   }
 
diff --git a/theatre/core/src/sheetObjects/SheetObjectTemplate.ts b/theatre/core/src/sheetObjects/SheetObjectTemplate.ts
index c54dfb7..10e28e5 100644
--- a/theatre/core/src/sheetObjects/SheetObjectTemplate.ts
+++ b/theatre/core/src/sheetObjects/SheetObjectTemplate.ts
@@ -24,6 +24,10 @@ import set from 'lodash-es/set'
 import getPropDefaultsOfSheetObject from './getPropDefaultsOfSheetObject'
 import SheetObject from './SheetObject'
 import logger from '@theatre/shared/logger'
+import type {
+  PropTypeConfig,
+  PropTypeConfig_Compound,
+} from '@theatre/core/propTypes'
 
 export type IPropPathToTrackIdTree = {
   [key in string]?: SequenceTrackId | IPropPathToTrackIdTree
@@ -32,7 +36,9 @@ export type IPropPathToTrackIdTree = {
 export default class SheetObjectTemplate {
   readonly address: WithoutSheetInstance<SheetObjectAddress>
   readonly type: 'Theatre_SheetObjectTemplate' = 'Theatre_SheetObjectTemplate'
-  protected _config: Atom<SheetObjectConfig<$IntentionalAny>>
+  protected _config: Atom<
+    SheetObjectConfig<PropTypeConfig_Compound<$IntentionalAny>>
+  >
   readonly _cache = new SimpleCache()
   readonly project: Project
 
@@ -87,13 +93,14 @@ export default class SheetObjectTemplate {
             this.address.sheetId
           ]
 
-        return (
+        const value =
           val(
             pointerToSheetState.staticOverrides.byObject[
               this.address.objectKey
             ],
           ) || {}
-        )
+
+        return value
       }),
     )
   }
@@ -139,8 +146,17 @@ export default class SheetObjectTemplate {
               )
               continue
             }
+
+            const propConfig = get(this.config.props, pathToProp) as
+              | PropTypeConfig
+              | undefined
             const defaultValue = get(defaults, pathToProp)
-            if (typeof defaultValue !== 'number') {
+
+            if (
+              typeof defaultValue !== 'number' &&
+              (!propConfig?.sanitize || !propConfig.interpolate)
+            ) {
+              //@checking defaultValue because tests don't provide prop config, and fail if this is omitted.
               continue
             }
 
diff --git a/theatre/globals.d.ts b/theatre/globals.d.ts
index b22bea7..1bbd4fd 100644
--- a/theatre/globals.d.ts
+++ b/theatre/globals.d.ts
@@ -46,7 +46,13 @@ declare module 'propose' {
 //   export default inspect
 // }
 
-declare module 'timing-function/lib/UnitBezier'
+declare module 'timing-function/lib/UnitBezier' {
+  export default class UnitBezier {
+    constructor(p1x: numbe, p1y: number, p2x: number, p2y: number)
+    solve(progression: number, epsilon: number)
+    solveSimple(progression: number)
+  }
+}
 declare module 'clean-webpack-plugin'
 declare module 'webpack-notifier'
 declare module 'case-sensitive-paths-webpack-plugin'
diff --git a/theatre/studio/src/StudioStore/StudioStore.ts b/theatre/studio/src/StudioStore/StudioStore.ts
index 308e73b..13ca49e 100644
--- a/theatre/studio/src/StudioStore/StudioStore.ts
+++ b/theatre/studio/src/StudioStore/StudioStore.ts
@@ -29,6 +29,7 @@ import {persistStateOfStudio} from './persistStateOfStudio'
 import {isSheetObject} from '@theatre/shared/instanceTypes'
 import type {OnDiskState} from '@theatre/core/projects/store/storeTypes'
 import {generateDiskStateRevision} from './generateDiskStateRevision'
+import type {PropTypeConfig} from '@theatre/core/propTypes'
 
 export type Drafts = {
   historic: Draft<StudioHistoricState>
@@ -146,6 +147,7 @@ export default class StudioStore {
                   if (typeof v === 'undefined' || v === null) {
                     return
                   }
+
                   const propAddress = {...root.address, pathToProp}
 
                   const trackId = get(
@@ -154,6 +156,12 @@ export default class StudioStore {
                   ) as $FixMe as SequenceTrackId | undefined
 
                   if (typeof trackId === 'string') {
+                    const propConfig = get(
+                      root.template.config.props,
+                      pathToProp,
+                    ) as PropTypeConfig | undefined
+                    if (propConfig?.sanitize) v = propConfig.sanitize(v)
+
                     const seq = root.sheet.getSequence()
                     seq.position = seq.closestGridPosition(seq.position)
                     stateEditors.coreByProject.historic.sheetsById.sequence.setKeyframeAtPosition(
diff --git a/theatre/studio/src/panels/DetailPanel/propEditors/DeterminePropEditor.tsx b/theatre/studio/src/panels/DetailPanel/propEditors/DeterminePropEditor.tsx
index 4a016e2..ca5a2be 100644
--- a/theatre/studio/src/panels/DetailPanel/propEditors/DeterminePropEditor.tsx
+++ b/theatre/studio/src/panels/DetailPanel/propEditors/DeterminePropEditor.tsx
@@ -16,10 +16,10 @@ export const getPropTypeByPointer = (
   pointerToProp: SheetObject['propsP'],
   obj: SheetObject,
 ): PropTypeConfig => {
-  const rootConf = obj.template.config.props
+  const rootConf = obj.template.config
 
   const p = getPointerParts(pointerToProp).path
-  let conf: PropTypeConfig = rootConf as PropTypeConfig
+  let conf = rootConf as PropTypeConfig
 
   while (p.length !== 0) {
     const key = p.shift()
diff --git a/theatre/studio/src/panels/DetailPanel/propEditors/utils/useEditingToolsForPrimitiveProp.tsx b/theatre/studio/src/panels/DetailPanel/propEditors/utils/useEditingToolsForPrimitiveProp.tsx
index a20eb77..d262d46 100644
--- a/theatre/studio/src/panels/DetailPanel/propEditors/utils/useEditingToolsForPrimitiveProp.tsx
+++ b/theatre/studio/src/panels/DetailPanel/propEditors/utils/useEditingToolsForPrimitiveProp.tsx
@@ -248,8 +248,10 @@ export function useEditingToolsForPrimitiveProp<
         callback: () => {
           getStudio()!.transaction(({stateEditors}) => {
             const propAddress = {...obj.address, pathToProp}
+
             stateEditors.coreByProject.historic.sheetsById.sequence.setPrimitivePropAsSequenced(
               propAddress,
+              propConfig,
             )
           })
         },
@@ -309,5 +311,5 @@ type Shade =
   | 'Sequened_NotBeingInterpolated'
 
 function isPropConfSequencable(conf: PropTypeConfig): boolean {
-  return conf.type === 'number'
+  return conf.type === 'number' || (!!conf.sanitize && !!conf.interpolate)
 }
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Left/PrimitivePropRow.tsx b/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Left/PrimitivePropRow.tsx
index 23601f4..2b1df84 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Left/PrimitivePropRow.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Left/PrimitivePropRow.tsx
@@ -52,7 +52,7 @@ const IconContainer = styled.button<{
       ? graphEditorColors[props.graphEditorColor].iconColor
       : nextPrevCursorsTheme.offColor};
 
-  &:hover {
+  &:not([disabled]):hover {
     color: white;
   }
 `
@@ -129,6 +129,9 @@ const PrimitivePropRow: React.FC<{
   }, [leaf])
 
   const label = leaf.pathToProp[leaf.pathToProp.length - 1]
+  const isSelectable =
+    leaf.propConf.type !== 'boolean' && leaf.propConf.type !== 'stringLiteral'
+
   return (
     <Container depth={leaf.depth}>
       <Head
@@ -144,6 +147,8 @@ const PrimitivePropRow: React.FC<{
           onClick={toggleSelect}
           isSelected={isSelected === true}
           graphEditorColor={possibleColor ?? '1'}
+          style={{opacity: isSelectable ? 1 : 0.25}}
+          disabled={!isSelectable}
         >
           <GraphIcon />
         </IconContainer>
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Right/PrimitivePropRow.tsx b/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Right/PrimitivePropRow.tsx
index 1c28579..bd51773 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Right/PrimitivePropRow.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/DopeSheet/Right/PrimitivePropRow.tsx
@@ -5,7 +5,7 @@ import {usePrism} from '@theatre/react'
 import type {Pointer} from '@theatre/dataverse'
 import {val} from '@theatre/dataverse'
 import React from 'react'
-import BasicKeyframedTrack from './BasicKeyframedTrack/BasicKeyframedTrack'
+import KeyframedTrack from './BasicKeyframedTrack/BasicKeyframedTrack'
 import Row from './Row'
 
 const PrimitivePropRow: React.FC<{
@@ -30,12 +30,9 @@ const PrimitivePropRow: React.FC<{
       return <Row leaf={leaf} node={<div />}></Row>
     } else {
       const node = (
-        <BasicKeyframedTrack
-          layoutP={layoutP}
-          trackData={trackData}
-          leaf={leaf}
-        />
+        <KeyframedTrack layoutP={layoutP} trackData={trackData} leaf={leaf} />
       )
+
       return <Row leaf={leaf} node={node}></Row>
     }
   }, [leaf, layoutP])
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/BasicKeyframedTrack.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/BasicKeyframedTrack.tsx
index 9d90bd4..d8dc299 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/BasicKeyframedTrack.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/BasicKeyframedTrack.tsx
@@ -115,13 +115,14 @@ function calculateExtremums(keyframes: Keyframe[]): Extremums {
   }
 
   keyframes.forEach((cur, i) => {
-    check(cur.value)
+    const curVal = typeof cur.value === 'number' ? cur.value : 0
+    check(curVal)
     if (!cur.connectedRight) return
     const next = keyframes[i + 1]
     if (!next) return
-    const diff = next.value - cur.value
-    check(cur.value + cur.handles[3] * diff)
-    check(cur.value + next.handles[1] * diff)
+    const diff = (typeof next.value === 'number' ? next.value : 1) - curVal
+    check(curVal + cur.handles[3] * diff)
+    check(curVal + next.handles[1] * diff)
   })
 
   return [min, max]
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Curve.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Curve.tsx
index 0fe1177..13c7e3b 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Curve.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Curve.tsx
@@ -19,21 +19,16 @@ const Curve: React.FC<IProps> = (props) => {
   const cur = trackData.keyframes[index]
   const next = trackData.keyframes[index + 1]
 
-  const handles = [
-    cur.handles[2],
-    cur.handles[3],
-    next.handles[0],
-    next.handles[1],
-  ]
-
   const connectorLengthInUnitSpace = next.position - cur.position
 
   const [nodeRef, node] = useRefAndState<SVGPathElement | null>(null)
 
   const [contextMenu] = useConnectorContextMenu(node, props)
 
-  const leftYInExtremumSpace = props.extremumSpace.fromValueSpace(cur.value)
-  const rightYInExtremumSpace = props.extremumSpace.fromValueSpace(next.value)
+  const curValue = typeof cur.value === 'number' ? cur.value : 0
+  const nextValue = typeof next.value === 'number' ? next.value : 1
+  const leftYInExtremumSpace = props.extremumSpace.fromValueSpace(curValue)
+  const rightYInExtremumSpace = props.extremumSpace.fromValueSpace(nextValue)
 
   const heightInExtremumSpace = rightYInExtremumSpace - leftYInExtremumSpace
 
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/CurveHandle.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/CurveHandle.tsx
index b7bd2b6..cc9d181 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/CurveHandle.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/CurveHandle.tsx
@@ -72,20 +72,23 @@ const CurveHandle: React.FC<IProps> = (props) => {
     // debugger
   }
 
-  const value = cur.value + (next.value - cur.value) * valInDiffSpace
+  const curValue = typeof cur.value === 'number' ? cur.value : 0
+  const nextValue = typeof next.value === 'number' ? next.value : 1
+
+  const value = curValue + (nextValue - curValue) * valInDiffSpace
 
   const valInExtremumSpace = props.extremumSpace.fromValueSpace(value)
 
   const heightInExtremumSpace =
     valInExtremumSpace -
     props.extremumSpace.fromValueSpace(
-      props.which === 'left' ? cur.value : next.value,
+      props.which === 'left' ? curValue : nextValue,
     )
 
   const lineTransform = transformBox(
     props.which === 'left' ? cur.position : next.position,
     props.extremumSpace.fromValueSpace(
-      props.which === 'left' ? cur.value : next.value,
+      props.which === 'left' ? curValue : nextValue,
     ),
     posInUnitSpace - (props.which === 'left' ? cur.position : next.position),
     heightInExtremumSpace,
@@ -165,7 +168,9 @@ function useOurDrags(node: SVGCircleElement | null, props: IProps): void {
         const dYInValueSpace =
           propsAtStartOfDrag.extremumSpace.deltaToValueSpace(dYInExtremumSpace)
 
-        const dyInKeyframeDiffSpace = dYInValueSpace / (next.value - cur.value)
+        const curValue = typeof cur.value === 'number' ? cur.value : 0
+        const nextValue = typeof next.value === 'number' ? next.value : 1
+        const dyInKeyframeDiffSpace = dYInValueSpace / (nextValue - curValue)
 
         if (propsAtStartOfDrag.which === 'left') {
           const handleX = clamp(cur.handles[2] + dPosInKeyframeDiffSpace, 0, 1)
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Dot.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Dot.tsx
index 16fd785..e35c4f9 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Dot.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/Dot.tsx
@@ -59,9 +59,12 @@ const Dot: React.FC<IProps> = (props) => {
   const next = trackData.keyframes[index + 1]
 
   const [contextMenu] = useKeyframeContextMenu(node, props)
-  const isDragging = useDragKeyframe(node, props)
+  const isDragging =
+    typeof cur.value === 'number' ? useDragKeyframe(node, props) : false
 
-  const cyInExtremumSpace = props.extremumSpace.fromValueSpace(cur.value)
+  const cyInExtremumSpace = props.extremumSpace.fromValueSpace(
+    typeof cur.value === 'number' ? cur.value : 0,
+  )
 
   return (
     <>
@@ -140,7 +143,7 @@ function useDragKeyframe(
         const cur: Keyframe = {
           ...original,
           position: original.position + deltaPos,
-          value: original.value + dYInValueSpace,
+          value: (original.value as number) + dYInValueSpace,
           handles: [...original.handles],
         }
         updatedKeyframes.push(cur)
@@ -149,29 +152,41 @@ function useDragKeyframe(
           const prev =
             propsAtStartOfDrag.trackData.keyframes[propsAtStartOfDrag.index - 1]
 
-          if (prev && Math.abs(original.value - prev.value) > 0) {
-            const newPrev: Keyframe = {...prev, handles: [...prev.handles]}
+          if (
+            prev &&
+            Math.abs((original.value as number) - (prev.value as number)) > 0
+          ) {
+            const newPrev: Keyframe = {
+              ...prev,
+              handles: [...prev.handles],
+            }
             updatedKeyframes.push(newPrev)
             newPrev.handles[3] = preserveRightHandle(
               prev.handles[3],
-              prev.value,
-              prev.value,
-              original.value,
-              cur.value,
+              prev.value as number,
+              prev.value as number,
+              original.value as number,
+              cur.value as number,
             )
           }
           const next =
             propsAtStartOfDrag.trackData.keyframes[propsAtStartOfDrag.index + 1]
 
-          if (next && Math.abs(original.value - next.value) > 0) {
-            const newNext: Keyframe = {...next, handles: [...next.handles]}
+          if (
+            next &&
+            Math.abs((original.value as number) - (next.value as number)) > 0
+          ) {
+            const newNext: Keyframe = {
+              ...next,
+              handles: [...next.handles],
+            }
             updatedKeyframes.push(newNext)
             newNext.handles[1] = preserveLeftHandle(
               newNext.handles[1],
-              newNext.value,
-              newNext.value,
-              original.value,
-              cur.value,
+              newNext.value as number,
+              newNext.value as number,
+              original.value as number,
+              cur.value as number,
             )
           }
         }
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/KeyframeEditor.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/KeyframeEditor.tsx
index 8cb95b3..4fe8a75 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/KeyframeEditor.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/BasicKeyframedTrack/KeyframeEditor/KeyframeEditor.tsx
@@ -35,7 +35,7 @@ const KeyframeEditor: React.FC<{
   const next = trackData.keyframes[index + 1]
 
   const connected = cur.connectedRight && !!next
-  const shouldShowCurve = connected && next.value - cur.value !== 0
+  const shouldShowCurve = connected && next.value !== cur.value
 
   return (
     <Container>
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/PrimitivePropGraph.tsx b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/PrimitivePropGraph.tsx
index 587ed58..c2e39ca 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/PrimitivePropGraph.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/GraphEditor/PrimitivePropGraph.tsx
@@ -10,6 +10,7 @@ import styled from 'styled-components'
 import type {SequenceEditorPanelLayout} from '@theatre/studio/panels/SequenceEditorPanel/layout/layout'
 import BasicKeyframedTrack from './BasicKeyframedTrack/BasicKeyframedTrack'
 import type {graphEditorColors} from './GraphEditor'
+import type {TrackData} from '@theatre/core/projects/store/types/SheetState_Historic'
 
 const Container = styled.div``
 
@@ -21,7 +22,7 @@ const PrimitivePropGraph: React.FC<{
   color: keyof typeof graphEditorColors
 }> = (props) => {
   return usePrism(() => {
-    const {sheetObject, trackId, pathToProp} = props
+    const {sheetObject, trackId} = props
     const trackData = val(
       getStudio()!.atomP.historic.coreByProject[sheetObject.address.projectId]
         .sheetsById[sheetObject.address.sheetId].sequence.tracksByObject[
@@ -35,7 +36,9 @@ const PrimitivePropGraph: React.FC<{
       )
       return <></>
     } else {
-      return <BasicKeyframedTrack {...props} trackData={trackData} />
+      return (
+        <BasicKeyframedTrack {...props} trackData={trackData as TrackData} />
+      )
     }
   }, [props.trackId, props.layoutP])
 }
diff --git a/theatre/studio/src/store/stateEditors.ts b/theatre/studio/src/store/stateEditors.ts
index 49bc8cf..d80eff0 100644
--- a/theatre/studio/src/store/stateEditors.ts
+++ b/theatre/studio/src/store/stateEditors.ts
@@ -46,6 +46,7 @@ import {
 } from '@theatre/shared/instanceTypes'
 import type SheetTemplate from '@theatre/core/sheets/SheetTemplate'
 import type SheetObjectTemplate from '@theatre/core/sheetObjects/SheetObjectTemplate'
+import type {PropTypeConfig} from '@theatre/core/propTypes'
 
 export const setDrafts__onlyMeantToBeCalledByTransaction = (
   drafts: undefined | Drafts,
@@ -432,6 +433,7 @@ namespace stateEditors {
 
           export function setPrimitivePropAsSequenced(
             p: WithoutSheetInstance<PropAddress>,
+            config: PropTypeConfig,
           ) {
             const tracks = _ensureTracksOfObject(p)
             const pathEncoded = encodePathToProp(p.pathToProp)
@@ -439,6 +441,7 @@ namespace stateEditors {
             if (typeof possibleTrackId === 'string') return
 
             const trackId = generateSequenceTrackId()
+
             tracks.trackData[trackId] = {
               type: 'BasicKeyframedTrack',
               keyframes: [],
@@ -502,11 +505,11 @@ namespace stateEditors {
            * Sets a keyframe at the exact specified position.
            * Any position snapping should be done by the caller.
            */
-          export function setKeyframeAtPosition(
+          export function setKeyframeAtPosition<T>(
             p: WithoutSheetInstance<SheetObjectAddress> & {
               trackId: string
               position: number
-              value: number
+              value: T
               snappingFunction: SnappingFunction
             },
           ) {
@@ -608,7 +611,7 @@ namespace stateEditors {
             )
           }
 
-          export function replaceKeyframes(
+          export function replaceKeyframes<T>(
             p: WithoutSheetInstance<SheetObjectAddress> & {
               trackId: string
               keyframes: Array<Keyframe>
@@ -620,7 +623,8 @@ namespace stateEditors {
             const initialKeyframes = current(track.keyframes)
             const sanitizedKeyframes = p.keyframes
               .filter((kf) => {
-                if (!isFinite(kf.value)) return false
+                if (typeof kf.value === 'number' && !isFinite(kf.value))
+                  return false
                 if (!kf.handles.every((handleValue) => isFinite(handleValue)))
                   return false