Exclusive group number for this region.
group opcode is used together with off_by to make
For example, the flute is by nature a monophonic instrument, so if a flute were
recorded with one microphone and had one set of samples, it would make sense to
set all its samples to have one group. A guitar is polyphonic, but each string
is monophonic, so a six-string guitar would naturally be split into six groups -
one per string. In these cases, the
group number will be equal to the off_by
This is also commonly used with hi-hats - this is an example of where things can get more sophisticated with a large number of groups involved, as it’s possible to set more closed hi-hat sounds mute more open ones, but not vice-versa, and it’s also quite possible that there are separate close mic, overhead and room samples.
group and off_by can also be used in other contexts where one sound
should cause another to stop but enforcing monophony is not the goal - for example,
a crash cymbal doesn’t need to be monophonic, as allowing the sound to build up
is reasonably natural, but if we wanted to implement a cymbal choke, then the
crash sounds would be in one group, the choke samples in another.
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