Configure audio tracks Selection Behavior. These settings affect which tracks will be added to the audio tracks list, and the settings used for each track. NSIsNotNil NSIsNotNil NSIsNotNil Audio tracks list. Track selection behavior and settings are loaded from the selected preset, and may be configured using the audio Selection Behavior dialog. HBEncoderTransformer Mixdown type. Controls how multi-channel audio is mixed into fewer channels, or whether the original channels are preserved. Dolby Surround and Dolby Pro Logic II convert multi-channel audio to stereo and matrix encode additional channels for surround reproduction on compatible equipment, while maintaining stereo compatibility. HBMixdownTransformer HBMixdownsTransformer Auto HBSampleRateTransformer Audio bit rate in kilobits per second (kbps). Smaller values reduce audio quality. Larger values use more data and may be less compatible. HBIntegerTransformer Dynamic Range Compression. Reduces the volume difference between loud and quiet sounds. Only applies to AC-3 source tracks when encoding to another format. 0: Do not apply DRC. 1: Apply DRC according to the compression hints embedded in the source track. Values greater than 1 further increase the volume of quiet sounds. Values greater than 2.5 are typically unnecessary and may introduce audible distortion. Dynamic Range Compression. Reduces the volume difference between loud and quiet sounds. Only applies to AC-3 source tracks when encoding to another format. 0: Do not apply DRC. 1: Apply DRC according to the compression hints embedded in the source track. Values greater than 1 further increase the volume of quiet sounds. Values greater than 2.5 are typically unnecessary and may introduce audible distortion. NSIsNotNil