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Voices: One.
Audio Outputs: One
External Inputs: Two: filter and ring mod.
Interface: 1 digital rotary encoder and 50 membrane switches.
Display: 3 digit green LED.
Memory: RAM: 512 patch locations in RAM.
Weight: 10 lbs.
Dimensions: 2 rack spaces, 10 inches deep.
Power: 90 - 250 volts AC auto switching.



Two voltage controlled discrete analog oscillators: OSC 1 waveforms: sine, sawtooth and variable width square; OSC 2 waveforms: triangle, sawtooth and variable width square; simultaneous waveforms output; syncing of Osc 2 to Osc 1; Oscillator 2 audio frequency modulation.


One voltage controlled discrete analog filter: 24db (classic Moog® style) in "Quad Filter System-Mini Mode" and four voltage controlled discrete analog filters in "Quad Filter System-4 Filters": classic Oberheim®, Moog®, Roland® 303, Arp® 2600 style; 12db filter modes: low pass, bandpass. Filters do not operate in series or parallel. (Unlike our legacy ATC-1, the filters are not plug-in cartridges, rather internaly mounted circuit boards.)


Standard ATC-X Moog® Source® transistor array style, or discrete SE-1X / MiniMoog® style; switchable via front panel. (Filters do not run in series or parallel.)


Three multiple stage envelope generators: attack, decay, sustain and release with inverting and multiple triggering; assignable 3rd. Envelope 1 fixed to filter frequency. Envelope 2 fixed to amplifier level.


Two low frequency oscillators––waveforms: triangle, sawtooth, reverse sawtooth, square, noise, random; parameters: destination, depth, key trigger, phase, midi sync.

Cross Modulaton (also listed in VCOs)

Oscillator 2 audio frequency modulation. Destinations: Osc 1 frequency, filter frequency.

Ring Modulator

Discrete analog external carrier input for external signal processing (bypasses Oscillator 2 function). Patchable via back panel connections.

Distortion Circuit

Discrete analog distortion (the heart of an MXR 90), programmable level controls per patch.

Additional Features

White noise generator, external input processor, exponential glide––parameters: time, autoglide interval, destination.

Modulation Destinations

LFOs 1 and 2 and envelope 3: VCO 1 and 2 frequency, pulse width and mix level, VCF frequency and resonance, noise level, Xmod mod amount, LFOs 1 and 2 rate and depth, VCA level.

MIDI Controllers

Modwheel and pressure, all LFO 1, 2 and envelope 3 destinations including envelopes 1 and 3 amount, dynamics: envelopes 1, 2 and 3 amount; bender: pitch, filter frequency.

MIDI Specifications

In and out, receives program change, bank select, glide on/off, glide time, volume, sysex, controllers: dynamics, modwheel, bender, pressure: each with one destination and amount. Fixed continuous controller assignments for all key functions.

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