The Dunlop Rotovibe is not really a univibe, it is a Leslie type modulator effect. And the 9 volt units don't sound like an 18, not even close. Good enough for some I guess, depends on what you want. For the record, I like them, and I use one, but when I want a Univibe sound, I stomp on my Fulltone. They are different enough to have both.
Technically, all univibe circuits are designed to mimic the Doppler effect of a Leslie speaker…even going back to the first Univox units. And having tried many vibes over the years, including the Fulltones, the Rotovibe is most definitely a univibe effect and not a rotary speaker emulator. I believe the naming comes down to Dunlop not wholly owning the Trademark for Univibe at the time of its release. I could be wrong on that one.
Hey Mike, I'd love to do a comparison, as I'm very interested in the new MXR UniVibe. At the moment, most of the pedals I feature in this videos are from my own collection. Unfortunately, the means to increase the size of my collection do not exist. Please share my videos with you friends and hopefully by you guys helping generate interest in my channel Dunlop will see fit to send one for me to feature...or by some way give me the income to get one to feature. Cheers!
It's a univibe, which was supposed to be a simulation of the Leslie speaker. As far as the Chorus/Vibrato labeling, I can't really explain why it is labeled that way. It's not really a chorus effect, sounds more like a phaser to me. But the vibrato is certainly a Vibrato effect.
