Roland made heaps of pedals in the days before Boss.
That thing has 70s Roland written all over it - literally. The power switch, LEDs and fooswitches are pretty much identical to the CE-1 or PhaseV/Jet Phaser type casing. Looks like it's some kind of leslie simulator for a keyboard or something. Must be rare because there's nothing on the net about it at all.
Revo = an abridgment of revolve, as in revolving speaker/baffle?
Hmm - looks like it's just the foot controller. I'd wager a guess that the speaker cab is essential to the effect