Thanks for the answer. That’s… astounding. I did pitch modulation in software on a Pentium II / 300 and it used less than one percent of the CPU. It’s one of the first things anyone will implement in a software sound renderer, because it’s the same thing as sample rate conversion. For this to be missing is … I don’t have words. Maybe I should have gone into liberal arts :-/ It’s like saying “oh, yeah, vertex colors aren’t supported” or something for graphics.