I implement a particular frequency-shifting method. It is not the best implementation because there are limitations within Audiotool, such as the Frequency Offset of Heisenberg, as well as the cut-off of the Curve filters (10KHz). Nonetheless, the effects are interesting enough that I think it might be useful.
You can read an explanation about this method here:
The first eight bars (along with other various parts in the audio) does not vary the Pulsar delay length.
After the section with the kicks, I ping a sine wave, and also changed the direction of the shift (downwards), and deliberately introduced artifacts so there would be some distortion and hence those in turn will become the source which the shifter will shift it down.
it work best if the delay (Pulsar) is very short-lengthed... so the freq-shifted copies would be a "tail" and not a "modified delayed copy". It works better if it gets morphed as part of the original sound
The feedback sounds which sounds inharmonic are the ones due to the SSB method, the one which sounds higher-pitch (and whose harmonic relationships are still preserved) are due to the Pulsar.
I think this might be misleading. Some pitch-shifting you hear are due to the Pulsar, but some of it is due to the method I linked above, especially the first few bars.