# Music Track Properties Properties for music tracks. ## Topics ### Constants [`var kSequenceTrackProperty_LoopInfo: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_LoopInfo) Looping information for a music track. [`var kSequenceTrackProperty_OffsetTime: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_OffsetTime) A music track’s start time in terms of beat number. [`var kSequenceTrackProperty_MuteStatus: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_MuteStatus) The mute/unmute state of a music track. By default this value is `false` (not muted). A read/write Boolean value. [`var kSequenceTrackProperty_SoloStatus: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_SoloStatus) The solo/unsolo state of a music track. By default this value is `false` (not soloed). A read/write Boolean value. [`var kSequenceTrackProperty_AutomatedParameters: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_AutomatedParameters) Indicates whether or not a music track’s purpose is audio unit parameter automation. If this property’s value is other than 0, music events in the track can only indicate points in an automation curve. A read/write `UInt32` value, where a value other than 0 indicates that the track is for parameter automation. [`var kSequenceTrackProperty_TrackLength: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_TrackLength) The time of the last music event in a music track, plus time required for note fade-outs and so on. [`var kSequenceTrackProperty_TimeResolution: UInt32`](/documentation/AudioToolbox/kSequenceTrackProperty_TimeResolution) The time resolution for a sequence of music events. For example, this value can indicate the time resolution that was specified by the MIDI file used to construct a sequence. --- 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)