Creatives generally need visual organisation and structure. S1 caters for this with colours already and as a UI/UX veteran I would like to suggest that S1 also adopts something similar to garage band in that an image or icon also represents what type of track it is.
User definable would be more useful than say one microphone to represent all vocals, but one icon would be a start :)
For example I may have:
- Centre lead vocal
- Side supporting vocal
- Backing vocal
- FX vocal