From wikipedia: MonotonicitySendy wrote: I still don't know what "monotonicity" does (I didn't see it covered in the manual), though obviously it has quite a strong effect on the stability of the sound.
The ability of a DAC's analog output to move only in the direction that the digital input moves (i.e., if the input increases, the output doesn't dip before asserting the correct output.) This characteristic is very important for DACs used as a low frequency signal source or as a digitally programmable trim element.
So basically when monotonicity=100% all the bits of the DAC influence the output as math perfect as you'd expect. When you drift from that you start to get weird shaveshaping due to bits slightly changing 'weight', or electronically speaking if you think of a 'Resistor ladder' made DAC, that the resistances are way out of tolerance. 95-100% should be used to stay in the 'realistic range', though realism sometimes gets in the way of FSU, so you can do what you want.
As far as changing the pitch of the IRs, thats slightly more complex than wave playback





