Many tube amps have Tremolo and a rare few have a much more “wobbly” version called a Vibrato.
An opto based device is used to modulate the guitar signal. This opto device is controlled by a sinusoidal low frequency oscillator. At low depth settings the Vibrato effect can be quite subtle. We also included a switch to swap between the traditional Tremolo to the uber cool Vibrato effect.
The TREMOLO mode is more “extreme” than on the TR-1 Optical Tremolo pedal. The VIBRATO mode gives a glorious wobbliness to the modulated guitar sound.