When determining the amount of polyphony when two k/boards are midi'd together, which one controls how many notes you can play at one time? For instance, if I were to purchase a Casio wk3200 and use as a master(because of its' 76 keys) and wanted to use my Tyros as a slave, how much polyphony would I have? Would it be determined by the Casio(master) or the Tyros(slave)?

Thanks in advance for any help.

Regards,
Ed

If you midi two keyboards together, each with 128 note polyphony, and play both of them together one controlling the other, theoretically, you should have 256
polyphony.

IMO, it would be determined by the Tyros not the Casio. The Casio in your scenario is used as a controller (no polyphony), it is merely sending MIDI notes to the Tyros. The Tyros is creating the voices, so it's polyphony are being used up.
Starkeeper

Polyphony is of the sound source..the keypad[keys] are not limited..If you play a 64 voice sound module with a Tyros[128 voice]..your module will still only have 64 polyphony..
Playing with the Tyros sound generator [layered with the sound module will still give you 64 from the module and 128 from the Tyros].

I want to thank everyone for their responses. I think I finally understand - the sound source determines polyphony. The sound source whether it is a sound module or internal to the keyboard, is the limiting factor in polyphony. Right??

Regards,
Ed

RIGHT.....Now it is feasible to split your keyboard[Casio]on the left hand side of split[Casio sound generator, 32 voice], and on the right of split the Tyros[128 voice...]..
This would yield 160 voice polyphony..

Got it! Thanks everyone.

Regards,
Ed