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# AUEventSampleTime

Expresses time as a sample count.

## Discussion

Callers of the [`AUScheduleParameterBlock`](/documentation/AudioToolbox/AUScheduleParameterBlock) and [`AUScheduleMIDIEventBlock`](/documentation/AudioToolbox/AUScheduleMIDIEventBlock) blocks can pass the `AUEventSampleTimeImmediate` value to indicate that the event should be rendered as soon as possible (in the next cycle). A caller may also add a small (less than 4096) sample frame offset to this constant.

> Note:
> The base ``doc://com.apple.audiotoolbox/documentation/AudioToolbox/AUAudioUnit`` implementation translates the `AUEventSampleTimeImmediate` constant to a true ``doc://com.apple.audiotoolbox/documentation/AudioToolbox/AUEventSampleTime`` value. Subclasses will not see this value.

## Topics

### Constants

[`AUEventSampleTimeImmediate`](/documentation/AudioToolbox/AUEventSampleTimeImmediate)


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