- muteFlags
- a bitmask to specify which MIDI tracks are muted. Bit 0 affects track 0, bit 1 affects track 1 etc.
- sync
- if false, the new mute flags will be applied as soon as possible by the JET render and playback engine. If true, the mute flags will be updated at the start of the next segment. If the segment is repeated, the flags will take effect the next time segment is repeated.
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Modifies the mute flags.