Hey, thanks for your replies.
@Jaime Oliver I've tried the phase vocoders. They works well, though the sound does become more artificial the lower
the speed is, e.g. more metallic with a contrabass sound. I really need
an infinite stretch though. If I go ahead and use
[I07.phase.vocoder.pd], do I need to modify it so that it reverses its
reading of the array once the end is reached, or so it cross-fades into a
rewind, or is there a better solution?
@michaelnoble I've also tried using [soundtouch~] for time stretching as demonstrated in its help file, but slowing down the playback and transposing it up leads to a very grainy, uncharacteristic sound.