---
title: "init(track:)"
framework: avfoundation
role: symbol
role_heading: Initializer
path: "avfoundation/avmutableaudiomixinputparameters/init(track:)"
---

# init(track:)

Creates a mutable input parameters object for a given track.

## Declaration

```swift
convenience init(track: AVAssetTrack?)
```

## Parameters

- `track`: The track to associate with the input parameters object.

## Return Value

Return Value A mutable input parameters object with no volume ramps and trackID set to track’s identifier.