---
title: sendLevelMetaParameterDefinition
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phasespatialpipelineentry/sendlevelmetaparameterdefinition
---

# sendLevelMetaParameterDefinition

A parameter that gradually updates the amount of audio signal that passes through to the output.

## Declaration

```swift
var sendLevelMetaParameterDefinition: PHASENumberMetaParameterDefinition? { get set }
```

## Discussion

Discussion Use this property to fade reverb effects into a spatial mixer’s output. For example, to begin with no reverb and gradually enable it, start by silencing reverb by setting the lateReverb entry’s sendLevel to 0. Begin the fade by calling fade(value:duration:) on this property with an argument of 1.