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# inputParameters

An array of input parameters for the mix.

```
var inputParameters: [AVAudioMixInputParameters] { get set }
```

## Discussion

The array contains instances of [`AVAudioMixInputParameters`](/documentation/AVFoundation/AVAudioMixInputParameters). You don’t need an instance for each audio track that contributes to the mix. By default, the system processes audio for those tracks without an associated `AVAudioMixInputParameters` instance.

> Warning:
> Specifying multiple `AVAudioMixInputParameters` for the same track has undefined behavior. Use only one instance per track in an audio mix.

---

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