---
title: gainMetaParameter
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phasemixer/gainmetaparameter
---

# gainMetaParameter

A parameter that changes the mixer’s volume gradually over a period of time.

## Declaration

```swift
var gainMetaParameter: PHASEMetaParameter? { get }
```

## Discussion

Discussion Use this property to smoothly adjust the volume of the mixer’s audio signals by calling fade(value:duration:). The framework sets the initial value of this property according to the metaparameter definition object’s gainMetaParameterDefinition.

## See Also

### Adjusting Volume

- [gain](phase/phasemixer/gain.md)