Of all the experimental effects possible with a looper, varispeed (aka tape style speed changes including reverse playback) is easily the most important. As an experimental looper I can’t help but envision the volume wheel having an alternate “varispeed” mode that lets us change the speed of the master clock. The varispeed wheel could speed tape up or down, and if you go down far enough, you hit tape stop. If you keep going past tape stop you speed back up in reverse. (Kind of like the speed modifiers in Chase Bliss blooper)
Varispeed could have a few different modes, Smooth, (for pure un quantized tape style speed changes), chromatically quantized speed changes, and maybe 5ths / octaves.
Controlling the master clock alone would be super powerful, because we could make a loop, then change speed, make another loop on top of the altered loop, reverse, make another loop etc. every time we change the master clock it alters everything that came before, as in the traditional canon of experimental looping.
That said, the additional option of changing speed / reversing individual tracks seems like it could be cool too. (But controlling the master clock of the whole looper is really more simple and elegant)
Who’s with me on this?