Good day!
If you run any of the following waves through the comb filter in Z3TA 2 and play with the polyphony set to more than 1, you get nasty sounds. The higher you turn the resonance, the more disturbing it becomes:
triangle, vintage triangle, baz it 1, baz it 2, additive 2, additive 4, additive 5, organ 1, organ 2, fret, sine^2, sine^3, very noisy, who knows, user 2, generated sine.
Is this a bug?