a) Record a sample and play it back at the wrong speed. Record this 'wrong' playback, play it back, record, and so forth. Try this while (1) playing back the sample with the same 'wrong' speed and (2) with a different 'wrong' speed.

patches/a-23-sample-false.pd

b) A recursive wave shaping algorithm using delay (i.e. an algorithm in which the output is fed back as input):

patches/a-24-waveshape-feedback.pd