---
title: Playback Parameterization
framework: phase
role: collectionGroup
role_heading: API Collection
path: phase/playback-parameterization
---

# Playback Parameterization

Change the characteristics of in-flight audio by adjusting its properties at runtime.

## Overview

Overview Metaparameters control several features of a sound source or sound event, as they play back. For instance, metaparameters can adjust a switch node’s toggle, or the amount of reverb that a sound source emanates. Attach Metaparameters to a Particular Sound To use a metaparameter, you attach it to a sound event or sound source. PHASE provides the following ways to attach metaparameters: Adjust a Property of a Single Audio Signal The framework refers to metaparameters that you access through a sound event’s metaParameters dictionary as local metaparameters. When you adjust the value of a local metaparameter, it affects just the sound event. The following code changes the volume on a specific sound event: Share a Parameter with Multiple Audio Signals The framework refers to parameters that affect many sound events or sound sources as global metaparameters. Real-time adjustments to global metaparameters affect the playback of all sound events that initialize with the metaparameter. The following code changes a weather metaparameter for all of its associated sound events: As part of the engine’s asset registry, the globalMetaParameters dictionary affects every playing sound event that shares a metaparameter that the dictionary contains.

## Topics

### Base Metaparameters

- [PHASEMetaParameter](phase/phasemetaparameter.md)
- [PHASEMetaParameterDefinition](phase/phasemetaparameterdefinition.md)
- [PHASEGlobalMetaParameterAsset](phase/phaseglobalmetaparameterasset.md)

### Linear Metaparameters

- [PHASENumberMetaParameter](phase/phasenumbermetaparameter.md)
- [PHASENumberMetaParameterDefinition](phase/phasenumbermetaparameterdefinition.md)

### Textual Metaparameters

- [PHASEStringMetaParameter](phase/phasestringmetaparameter.md)
- [PHASEStringMetaParameterDefinition](phase/phasestringmetaparameterdefinition.md)

### Graphed Metaparameters

- [PHASEMappedMetaParameterDefinition](phase/phasemappedmetaparameterdefinition.md)

## See Also

### Dynamic Sound Control

- [PHASEEnvelope](phase/phaseenvelope.md)
- [PHASEEnvelopeSegment](phase/phaseenvelopesegment.md)
- [PHASECurveType](phase/phasecurvetype.md)
- [PHASENumericPair](phase/phasenumericpair.md)