Re: Roto Vibes...What can you tell me / educate me about them?
Just to clarify, as ThisDyingSoul mentioned, the name "RotoVibe" refers to a pedal Dunlop used to produce that approximated the sound of the Uni-Vibe in a treadle package. Dunlop also purchased the name Uni-Vibe and has produced two versions over the years. The old one (big chrome housing) is a "true" univibe using the photo cells and lamp. The new one (small black enclosure) is not a "real" Uni-Vibe, but a FET based phaser that approximates the sound of it.
At this point, I'd either buy a "real" circuit or a digital copy. Ones to investigate:
Voodoo MicroVibe
Sweet Sound MojoVibe
Fulltone DejaVibe
Drybell Vibe
Korg NuVibe
KR MegaVibe
FoxRox AquaVibe/Captain Coconut
Digital: TC Viscous Vibe
Uni-Vibes are like fuzz pedals, they are very temperamental, sensitive to rig and pickup impedance, other pedals, amps, etc. we can all say what our favorites are, but your rig will be different.