From the RBN Docs:
These are close up shots that are used to emphasize a player, specifically hand animations, lip sync, and kick pedal movement. They are great for interesting vocals sections, guitar or bass solos, or parts with heavy drum work.
- [directed_bass_cls] = fretboard shot *
- [directed_guitar_cls] = fretboard shot *
- [directed_drums_kd] = drummer’s kick pedal *
The asterisk says:
*These free directed cut flags only involve unique camera angles while still using looping animation flags authored on the instrument tracks.
What precisely does this mean? I am not sure what "looping animations" are, for example... but I am familiar with [play], [idle], etc.