---
title: supportedChannelCounts
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/auaudiounitbus/supportedchannelcounts
---

# supportedChannelCounts

An array of numbers indicating the supported number of channels for this bus.

## Declaration

```swift
var supportedChannelCounts: [NSNumber]? { get set }
```

## Discussion

Discussion If the value of this property is nil, then any number less than or equal to the value of maximumChannelCount is supported. If setting a new value on this property makes the current bus format unsupported, then the value of format is set to nil. The default value is nil.

## See Also

### Audio Unit Implementations

- [init(format:)](audiotoolbox/auaudiounitbus/init(format:).md)
- [maximumChannelCount](audiotoolbox/auaudiounitbus/maximumchannelcount.md)