If you are in need off a classic tremolo/vibrato effect with excellent sound and with a wider range of control for very slow and exceptionally deep sounds, you would want to try the Tremster from T-Rex-Engineering.
The Tremster creates the buttery, seductive tone from a vintage tube amp tremolo.This is accomplished by slightly boosting the signal, thus resulting in a more saturated tone.The Tremster has all the controls you would expect with depth, volume and speed dials as well as a MODE-button switching between tremolo/vibrato-effect and a foot switch to toggle the effect on or off.
Last but not least The Tremster has a flashing LED light that will help to tailor the speed of the effect and get it in time with your tune.
Specifications- External connectors - Input Jack. Output Jack, 9V DC Jack
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Controls - On/Off, Volume, Speed, Depth, Mode