Get RR Groups for message

[d.healey]

This function only returns 0 for me.

[Christoph Hart]

Have you called Sampler.refreshRRMap() before that?

Basically it cashes a "minesweeper" like map of the max amount of round robins for a given note / velocity combination so you can handle variable RR sizes. This is a bit expensive and calculating this on every voice start would be inefficient, so that's why you need to call the above method once on startup (or when your sample set changes) and it'll recalculate the map.

[d.healey]

Oh yes I remember about that now. I had forgotten to do it. Thanks!