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Alesis S4 QuadraSynth Rack

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The Alesis S4 QuadraSynth is a 64 voice, rackmount MIDI sound module featuring built-in parallel-matrix digital signal processing. The 64 has a large, easy-to-read, back-lit LCD display for "Composite Synthesis," which is an innovative combination of subtractive and additive synthesis.

Each program can be made up of as many as four individual "sounds" each with their own set of 3 envelope generators, 3 LFO's, tracking generator, dynamic low pass filter, and very comprehensive modulation matrix.

In the "Program Mode," the S4 has 128 present and 640 user programs in which the user can program up to 7 simultaneous effects which can be independently assigned to any of four effect busses. This allows different programs or composite sounds to be routed to different effects with dynamically controllable amounts.

In the "Mix Mode," the S4 has an additional 100 preset and 500 user programmable "Mixes" which can be used for multi-timbral sequencing applications. In this mode, different programs may be assigned to each of the 16 MIDI channels simultaneously, and have allows you to have separate discrete effects on different sounds with complete mix control. That's why we call it "Mix Mode" rather than a simple multipatch.

Programs may be routed to any of the four audio output jacks on the back and the S4 supports optional PCMCIA Sound cards.

Technical Specifications
Type: Digital
Synthesis: ROM, Subtractive
Oscillators: 4
Waveforms: ROM
ROM Size: 16
ROM Resolution: 16 bit, 48 kHz
Osc Modulation: Continuous Controller, Envelope, Keyboard, Knob, Mod Wheel, Oscillator, Pitch Wheel, Glide / Portamento
Envelopes: 3
Evelope Paramerters: Delay, Attack, Decay, Sustain, Release
Filters: 1
Types: 12dB Slope (2-pole), Low Pass
LFO: 3
LFO Parameters: Noise, Sample & Hold, Saw Up, Saw Down, Sine, Square, Triangle, Clocked, Delay, Key Sync
Polyphony & Tuning
Polyphony: 64
Timbrality: 16
Tuning: Standard
Patches RAM: 640
Patches ROM: 128
Multipatches RAM: 500
Multipatches ROM: 100
Storage: Internal, RAM Cartridge
Editing: MIDI
Up to 7 effects per patch based on QuadraVerb 2 chip set.
Case: Rack
Case Details: 1U rack 19 inch
Controls: Knobs, Pedal - Patch Change
Audio Output Connections: 1/4" Phone Jack, ADAT, Stereo Main, Stereo 2
Audio Output Notes: 4 Audio, 2 Adat Optical, Stereo Headphones
Inputs: 48K Clock
DAC Bits: 16
DAC Frequency Rate: 48
Power: 120V AC
Year Released: 1993
Year Discontinued: 1995
Manuals & Documents
MSRP List Price: $995 - convert
Retail Street Price: $899 - convert
Used Price: $75 - $175 - convert

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