> Another disadvantage was that you get a noticable chirp transient when > the phases realign after one complete cycle of the wavetable.
Just put them in the buffer with random phases and they'll never re-align. That's not what a piano does of course, but might be servicable. BTW, my synth does PW/PWM with two out-of-phase sawtooths, one negative. When I make the harmonics of one of the sawtooths random, you get something that sounds like PWM except it never comes to a "peak", it just grinds away. I haven't heard that on any other synth but would love to know if anyone knows prior art.
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