TRM-1 Tremulator


“I have often been asked how I got involved in the guitar pedal business. In 1982 Ry Cooder came to me asking if I could make him a tremolo pedal, as none were being made at the time. After some experimentation, and Ry’s old Fender twin amp as a sound model, the Tremulator was born. At first they were in unpainted Bud boxes with dymo labels, but as time went on they appeared in a number of painted boxes until the present version, which I think is the nicest. This effect was named by Guitar Player Magazine as ‘one of the fifty coolest effects pedals of all time.'”
– James

Our pedals are usually in stock and ship within 48 hours. On the rare occasion that the pedal is not in stock, it can take up to 5 working days to ship out.

93 in stock

SKU: TRM-1 Category:


Classic Sound without the noise

A hybrid of vintage sound and state-of-the-art quality, the Demeter Tremulator is designed for years of trouble-free operation.Designed to emulate the classic Fender tremolo effect (or vibrato as it is often referred to), the Tremulator features “lopsided” amplitude modulation with a rounded off traingular modulant waveform. Suffice it to say, the Tremulator sounds like the classic effect found on many vintage amps, but with less noise and hum and a greater range of speeds and depths.

Operation is fairly straightforward. There are two inputs on the front side of the unit: a 1/4″ input jack on the right and a 1/4″ output jack on the left with a battery-ground switch on the input jack.

There are two controls on the unit: Depth and Speed, plus a footswitch to bypass the effect, and an LED to indicate effect operation. On the side there is a trim pot to set the bias for the optical unit.

Depth affects the amount of amplitude modulation on the signal or the amount of effect. The tremulator design incorporates a small amount of gain (approx. 1dB) to allow for proper “tremulation.” Also, by turning the Depth all the way off, the TRM-1 will function as a low noise volume boost. It’s low-impedance output allows it to act as a line-drive, eliminating signal loss on long cable runs.

Speed increases and decreases the frequency of the low-frequency oscillator, enabling you to time the effect as desired.

Trim pot sets the bias of the optical tremolo unit. It effects the signal on and of time ratio. Turned up to height it will squeeze the signal, low it will loosen it. The unit comes preset to Ry Cooder’s preferred setting.

Power supply: 9 volts DC. Either external or internal. For internal power, use a 9 volt battery. To access, remove the four screws on the sides of the unit and pull apart. Note: battery must have at least 7 volts for unit to work! External power supply using standard Boss type adapter; 9 volt DC regulated (100 milliamp or more).


Download product manual

Sound Clips

Washburn WI68 through Fender Super Reverb

  • Clean, Uneffected

  • Medium Depth, Medium Speed

  • High Depth, Slow Speed

  • High Depth, Slow Speed

  • Medium Depth, High Speed

  • Medium Depth, High Speed

  • Medium Depth, Medium Speed


1982 Fender ’52 Telecaster, Vox AC30TBX, 12″ Celestion Alnico Blues, Shure SM-57, Yamaha Microphone Preamp, ProTools HD 24/96kHz.

  • Chords, Medium

  • Chords, Deep

  • Chords, Shallow

  • Sweeps

Video Clip

Additional information

Weight 2 lbs
Dimensions 8 × 8 × 8 in


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