# AUMultibandCompressor Parameters ## Topics ### Constants [`var kMultibandCompressorParam_AttackTime: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_AttackTime) [`var kMultibandCompressorParam_CompressionAmount1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_CompressionAmount1) [`var kMultibandCompressorParam_CompressionAmount2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_CompressionAmount2) [`var kMultibandCompressorParam_CompressionAmount3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_CompressionAmount3) [`var kMultibandCompressorParam_CompressionAmount4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_CompressionAmount4) [`var kMultibandCompressorParam_Crossover1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Crossover1) [`var kMultibandCompressorParam_Crossover2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Crossover2) [`var kMultibandCompressorParam_Crossover3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Crossover3) [`var kMultibandCompressorParam_EQ1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_EQ1) [`var kMultibandCompressorParam_EQ2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_EQ2) [`var kMultibandCompressorParam_EQ3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_EQ3) [`var kMultibandCompressorParam_EQ4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_EQ4) [`var kMultibandCompressorParam_Headroom1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Headroom1) [`var kMultibandCompressorParam_Headroom2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Headroom2) [`var kMultibandCompressorParam_Headroom3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Headroom3) [`var kMultibandCompressorParam_Headroom4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Headroom4) [`var kMultibandCompressorParam_InputAmplitude1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_InputAmplitude1) [`var kMultibandCompressorParam_InputAmplitude2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_InputAmplitude2) [`var kMultibandCompressorParam_InputAmplitude3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_InputAmplitude3) [`var kMultibandCompressorParam_InputAmplitude4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_InputAmplitude4) [`var kMultibandCompressorParam_OutputAmplitude1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_OutputAmplitude1) [`var kMultibandCompressorParam_OutputAmplitude2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_OutputAmplitude2) [`var kMultibandCompressorParam_OutputAmplitude3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_OutputAmplitude3) [`var kMultibandCompressorParam_OutputAmplitude4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_OutputAmplitude4) [`var kMultibandCompressorParam_Postgain: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Postgain) [`var kMultibandCompressorParam_Pregain: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Pregain) [`var kMultibandCompressorParam_ReleaseTime: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_ReleaseTime) [`var kMultibandCompressorParam_Threshold1: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Threshold1) [`var kMultibandCompressorParam_Threshold2: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Threshold2) [`var kMultibandCompressorParam_Threshold3: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Threshold3) [`var kMultibandCompressorParam_Threshold4: AudioUnitParameterID`](/documentation/AudioToolbox/kMultibandCompressorParam_Threshold4) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)