Studio Electronics ATC-X Quad Filter Rackmount Analog Synthesizer SN 1161

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"SPECIFICATONS
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.

VOICE ARCHITECTURE

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

VCF(s)
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, high pass and band reject. 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.)

Envelopes
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.

LFOs
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.

Distoriton 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
Dynamics, modwheel, bender, pressure: one destination and amount per; 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 and filter frequency. Fixed continuous controller assignments for all key functions.

MIDI Specifications
In and out, receives program change, bank select, glide on/off, glide time, volume and sysex."