Provibe - The Provibe section is an exact reproduction of the classic Univibe. It's a tweaked four-stage phase shifter with an unusual but distinct modulation circuit. In Chorus mode, the phased signal is summed with the input signal to produce its signature psychedelic sound. In Vibrato mode, only the phased sound is used, producing a warm warbling effect. The phasing is done with four photocells arranged around a light source. A metal reflector is used to distribute the light evenly to all four photocells. The sound of the Provibe is identical to that of the best Univibes. Since many Univibes sounded slightly different from one another, the Provibe includes a Center control which allows you to dial in all of the different Univibe sounds you've heard so that you can zero in on the sound you're looking for. Speed is controlled by the front panel Speed knob, or externally via the ¼" TRS Pedal jack.

Controls

Volume

Width - Controls the intensity for the vibe effect.

Center - Controls the bias of the vibe effect. Dial in the right amount of "off-center" wobble associated with the vibe effect. If you turn the Width control all the way down, you can use the Center control as a manual phase shift knob.

Speed - Manual control of speed. You can also use the Pedal jack on the rear of the unit to hook up a speed control pedal. This disables the Speed knob.

Chorus / Vibratto switch - Select between the distinct four stage phase shifter sound and warm pitch vibrato.