or is it coming up this week?
i would be tempted to use all of my extra sounds - such as strings, syth voice, brass, etc. for various preludes and fugues. then - people get the idea of voicing and how much bach used it in the ideas for the fugues. that the prelude was a sort of organ preparation for many voices singing. or the mass choir - and then, just a few select voices.
what i mean is different instruments for different preludes and fugues. but, as you say - all one instrumentation.
Ah, I understand Would be possible, but I'm in a puristic mood these days. I will only use the piano sound.
With lots of dynamic changes, rubato and pedal - of course