Expression Pedal Options
by Phil Taylor
I’ve received several emails from customers enquiring about a suitable expression pedal for controlling the modulation speed of the Tube-Vibe. The Tube-Vibe is 100% compatable with stock Roland EV-5 and the higher quality EV-7 expression pedals (no modification required). These pedals have been tested by Effectrode and a few of our customers in conjunction with the Tube-Vibe and found to operate very well. Both expression pedals have an adjustment knob on the side which allows fine-tuning of the control range of the pedal and therefore the modulation rate of the Tube-Vibe. The Effectrode Tube-Vibe and Phaseomatic are also compatible with the Moog EP-2 and Mission Engineering SP-2 expression pedals.
For even more sophisticated control of the Tube-Vibe (or any of our other pedals) you may want to consider using a mechanical expression pedal manufactured by Tone in Progress. This pedal makes it possible to adjust the the Volume or Intensity pots, in fact control of any parameter where a knob can be removed to faciltate connection of the mechanical linkage.
DIY Expression Pedal
For the last year or so, I’ve been using a modified Jim Dunlop “Hi-Gain” volume pedal with good results. The pedal is of sturdy, solid diecast aluminium contstruction and retails at a reasonable $59-95. The modification is relatively straightforward and requires no knowledge of electronics, however you will need a soldering iron, screwdriver, sharp knife or scalpel and some wire.
Expression pedal input facilitates the use of a passive volume pedal as a speed controller. The potentiometer inside the volume pedal should have a resistance of 10K to 250K and should be connected as shown below.
It is also possible to control the Tube-Vibe using an external voltage source or generator. The voltage applied to the wiper (tip) should be in the range of 0 to 5 Volts. This allows for virtually unlimited variation in sweep and modulation effects.