On 21/01/2010, Mark Hadman <markhadman(a)googlemail.com> wrote: [re Mx44.x] Almost. In each of the operators, you have a checkbox next to the envelope controls, a set of 8 radio buttons, a pair of checkboxes in the top right hand corner, and a checkbox immediately below that pair. Respectively, these are "waveshaper" (if checked, the wave is sent through some kind of "resonant" waveshaping), "harmonic" (selects one of the first 8 harmonics to add to the fundamental sine wave*), "complex" (I think - don't quote me - the harmonic modulates the fundamental instead of being added to it) and "lowpass" (clobber the higher harmonics produced by the operator), and "magic" (some kind of subtle detuning / phase manipulation effect - try it and see). * Of course, I say "sine wave" - the operators don't use pure sine waves; they use an extremely cheap to compute in MMX, but very rough and audibly square-ish, approximation.