The TR-1 is a vintage style tremolo same as what you would find in a classic Brittish tube amp. Has an all valve signal path using an EF86 pentode running at 225volts for crystal clear tone. Controls are as follows: Intensity, Speed, Volume, Treble and bass. There is a standby switch to extend the life of the valve. There are 2 footswitches: Bypass-bypasses the entire effect pedal. The other footswitch shuts off the tremolo effect leaving you a clean preamp/booster. High volume levels are available for you to overdrive your tube amp if desired.