---
title: clockSource
framework: Core Audio
role: symbol
role_heading: Instance Property
platforms: [macOS 15.0+]
path: coreaudio/audiohardwareaggregatedevice/clocksource
---

# clockSource

The device, clock, or tap that is currently serving as the time base of the aggregate device.

## Declaration

```swift
var clockSource: AudioHardwareObject? { get throws }
```