This is a copy and paste from an HC thread, but I still get excited thinking about something like this:

Basically the idea would be to have a looper that uses the technology of the HOG expression modes to control various parameters on loops. (when using my SMMH I find myself kneeling down to tweak too much, if only I had a 3rd arm so I wouldn’t have to tap or strum open notes to keep my guitar parts going while doing so)

SMMH sized enclosure, but vertical
some knobs at the top to control different things.

4 footswitches- on/off, record, and expression select, and expression direction.

Expression controls:
1. forward/reverse (toe down puts it in reverse, heel down it in forward)
1a. If the expression direction is reversed, it works the same, but the phrase will not be reversed until it has finished playing.
2. speed/pitch (toe down is an octave up or down based on direction)
3. filter (low pass/high pass depending on direction)
4. modulation (heel down turns it off, controls depth/speed based on direction)
5. feedback- toe down is 100%, below that your overdubs start to fade with each successive loop.
6. volume- controls wet volume
7. undo- toe down and it will undo the last overdub (reverse direction for redo, only has a one overdub memory)
8. Reverse record- when set to this mode, when you record your overdub, it is immediately reversed upon playback
9. pitch shift record- works like reverse but with pitch. (the purpose of these two modes is so you don’t have to pitch shift or reverse the whole track to record a reversed or pitch shifted overdub)
10. multiply- toe down doubles loop length
11. tap mode- expression select button works as a tap tempo button

With all the expression modes the change isn’t realized until you rock the expression pedal- sort of how knobs work on digital pedals in preset modes. That’s so that switching through all the modes you don’t make a bunch of weird noises and funk up your settings. When you switch away from a setting you changed, the setting is kept at where you left the rocker. So if you go to the modulation setting and ramp up the depth and then switch direction- the depth will remain the same as you left it while you adjust speed.

Put a 300-400 dollar price tag on it and it would pretty much be the best looping pedal ever.