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When MIDI content is played-back in the Music Hierarchy, the music objects send MIDI data to the MIDI target (the instrument), located in the Actor-Mixer Hierarchy. The actual audio content played-back to the MIDI target will play in the Actor-Mixer Hierarchy context, not in the MIDI source location's context. This means the voice properties on music objects will not affect the instrument being played.

For example, the Voice Volume on a Music Segment or Music Track would not affect a piano instrument, located in Actor-Mixer Hierarchy. To modify the voice volume of the piano, you would need to modify the Voice volume on the Piano object directly, not on the MIDI source.

To help mixing, a bus hierarchy can be created to combine instrument content with music audio content. Routing the instrument and the music track to the same bus would provide a single audio mixing point.