Noticed something that (to me) seems odd, while trying to figure out a way to avoid FM in Wave mode from drastically changing the quality of the sound across note ranges (i.e. modulates at faster rate for higher notes).
Set Osc Balance so only one Oscillator is audible (to make this more obvious). Then put that Oscillator's Key Follow to 0. Experimenting while holding a note when changing from 32 to 0 Key Follow, you will notice that lower notes increase in pitch and higher notes decrease - it seems some C in the middle is used a base pitch or something. I'm assuming this is what leads to the odd behavior that follows.
With Key Follow set to 0, go to the Mod Matrix and set Slot 1's source to Key Follow, and its Destination to the Oscillator's pitch. Set amount to 32, notice that the Oscillator's pitch matches what it normally does with its own Key Follow at 32.
Set Slot 1's amount to 0, and set Slot 2's Destination to Slot 1 amount. Set Slot 2's amount to 32. Notice that low notes now effectively play backwards (edit: while high notes continue to ascend almost normally, though they cap out early).
Not entirely certain why this happens. I don't suppose anybody has any thoughts on making use of this behavior?