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The percussion keys play either sampler 3 or 4, AU 3 or 4, or the cello etc, so if you load one of the normal keygroups with the same instrument as the percussion keys, you can arm that instrument with the keygroups recorder arm key. You can then switch that keygroup away from whichever instrument is also loaded on the percussion keys, but the percussion keys are then armed and ready. The arming is done on an instrument by instrument basis, not on a keygroup by keygroup basis.

Hope that helps.

...which means there's no way to have multiple concurrent recordings playing back on the same instrument without loading that instrument into multiple sampler or AU slots?

Hi ollie, this used to be the case but since version 1.2.5 or so it is now possible to 'overdub' recordings and have several layers from one instrument. In the recorder controls (keygroup mode key + the key 2 keys above it), the fifth course has a new 3rd key which toggles from red to green according to whether new takes overwrite or overdub.

If you want to record onto the same instrument from 2 keygroups at a time this should work by arming the instrument in either keygroup, and then playing on both keygroups (no need for overdubbing).