On Sun Sep 11 23:46 , harryhaaren(a)gmail.com sent: each sample individually it really does become pretty heavy on the CPU. Unless your not *dynamically* changing the value of the pitch shift, in which case it can be rendered to a buffer & just played back.I would share the source if it was in better condition, most of it is hacks on hacks for extra random features... but I can zip it & ship it to somebody if they'd care to take a look. A JACK client wrapper would need to be coded up, its only the "sampler / pitch shifter" now. > Best free library from timestretch I know of is the RubberBand one.There is also SoundTouch, its LGPL even more relaxed than the GPL of RubberBand. Its what I used for the project mentioned above.Cheers, -Harry Hydrogen 0.9.5 does all of this .. It uses the rubberband library and has a fairly simple interface.. you don't have to use it's internal sequencer.. but it's pretty damned good for writing loops..