I have a couple questions:
You say that keyboards are allowed: Most workstation keyboards and related synths allow the user to have split instrumentation, so that one range of the keyboard is X instrument and another range is Y. Is this allowed?
Also, would a bass guitar be counted as a polyphonic or monophonic instrument for the purpose of this challenge? Like the traditional string section, it technically can play polyphonically, but is almost always used monophonically.
Last question in relation to the previous: Is a monophonic synth allowed? Like, I had two synth keyboards, one set to play polyphonically and another that was monophonic for the bass line, is that acceptable or no?