> ## Documentation Index
> Fetch the complete documentation index at: https://chart-spec.enchor.us/llms.txt
> Use this file to discover all available pages before exploring further.

# ConversionCause

```ts theme={null}
type ConversionCause = 
  | "notes"
  | "starPower"
  | "solos"
  | "flexLanes"
  | "drumFills"
  | "rangeShifts"
  | "tempoMap"
  | "trackAdded"
  | "trackRemoved";
```

What changed a track's TrackHash: the part of its canonical semantics that differs, or its tempo map.


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