The limbs the player has available.
Limbs that can strike each voice, in preference order, keyed by MIDI note.
Optionaloverdub?: readonly number[]Voices dubbed over the kit on a pass of their own, by MIDI note number.
A tambourine or a shaker riding a groove whose backbeat already commits
both hands is a second pass, not a third hand: it is played over the kit,
so it takes no limb from the kit and none from another overdub. Such a
voice is still held in a hand on its own pass, so it keeps its reach
entry and remains a voice of the instrument; this names which of them are
played that way.
A percussion setup, described by the voices within reach of each limb.
A kit's constraint is not range but limbs: a voice no limb can reach is not on the instrument, and two voices needing the same limb at the same instant cannot both sound.