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Dug my old DigiTech RP350 out just to screw around with it since I haven't touched it in a few years, and found that if you put the effect as whammy and change the expression pedal perimeters to control "shift", you get almost like a step whammy type effect with different points in the treadle jumping to random octaves/harmonies. Pretty fun, might try and incorporate it in a new song.

Yeah it's been like 4 years since I've touched mine...
it was my first "pedal" and only made noises with it...
which was cool

I think the Korg AX1000/1500/3000 does that, too. It lets you select your harmonized interval on the fly.

those Korg ones are so killer i wish i had one w/ an expression pedal