Group Solo
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It is sometimes helpful to be able to isolate a single RR group when trying to tweak samples, currently I'm doing this via volume control of the groups but it would be handy if there was a little group solo button.
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Why not add a ScriptProcessor that sets the RR index to a fixed value to "solo" this group?
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Oh yeah, that's a good idea :)
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It appears that
setActiveGroup()doesn't work when Group XF is enabled, is this correct? - 
Well as soon as the GroupFX is enabled, all groups are supposed to play simultaneously so this method looses its purposes, so yes that would be the case.