> ## 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.

# FormatSupport

```ts theme={null}
type FormatSupport = "perDifficulty" | "perInstrument" | "perNote" | "kept" | "unsupported";
```

How a format stores a feature: for each difficulty, once for the instrument, on each note, or not at all.


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