The Therevox ET-4.1 is an analog continuous pitch instrument inspired by the interface of the rare Ondes Martenot.

Each oscillator has six different waveforms, including the classic sine wave of the Electro-Theremin and the Ondes Martenot’s unique octiviant and white noise settings. Each oscillator can be tuned separately, or synched to create intervals or interesting harmonics. Oscillator 2 can also be set to a consistent note or used as an LFO to modulate the filter. The internal low-pass filter with variable cutoff frequency is used to shape the sound and this can also be controlled with an external expression pedal or CV source.

Here’s a video intro to the Therevox ET-4.1:

Details and Specifications

• Two independent temperature compensated analog oscillators with sync function
• Six octave positions for each oscillator covering C0 to C8
• Six waveforms (sine, triangle, rectified sine/octiviant, 50% pulse, 30% pulse, 10% pulse (white noise on Osc 2)
• Adjustable ring with metal reinforced wire
• Replaceable reference keyboard with alternatives available (ex: lapsteel, specific scales, microtonal)
• Dual wooden pressure-sensitive intensity keys with approx. 3/4″ travel
• Low-pass filter with adjustable cutoff frequency (can be controlled by expression pedal or external CV)
• Internal spring reverb with dry+wet mix control
• “Silent” tuner output, switchable between oscillators
• Line-level (+3db) output with volume control
• Control Voltage (CV) outputs for ring position (1V/octave) and both intensity keys (0 – 10V)
• 16VAC power input
• Dimensions: 30 x 11 x 4″
• Includes: Printed manual, power supply (110-120V and 220-240V Available) and extension cable.
• Made in Canada

The Therevox ET-4.1 is priced at US $1475. See the Therevox site for details.