Does MSSIAH provide both polyphonic MIDI playing as well as multitimbral modes?

Short answer: Yes. Each application responds to MIDI in its own way, MonoSynthesizer being a monophonic synthesizer, Drummer using a keyboard map etc. The Sequencer app has three modes of operation: Multi (1-6 individual channels), poly (up to 6 voice polyphony with two SIDs) and Multi/Poly where SID #1 is multitimbral and SID #2 is polyphonic. Note that the MSSIAH apps (except Wave-Player being 100% MIDI controlled) still operate in "Prophet64" standard mode.

Switching to MIDI mode makes the application respond to MIDI messages only. More.

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