---
title: rampDurationSampleFrames
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/auparameterevent/rampdurationsampleframes
---

# rampDurationSampleFrames

The ramp duration, in sample frames. Must be 0 for a non-ramped event; otherwise, must be greater than 0 for a ramped event.

## Declaration

```swift
var rampDurationSampleFrames: AUAudioFrameCount
```