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Alesis S5 QuadraSynth Keyboard

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In the Quadrasynth's composite synthesis system, up to four "tones" are used to create a single "patch" or synthesizer sound. These individual "tones" are created by using 16-bit digital single-cycle waveforms or digital samples as oscillator sources, and are then processed via a digital non-resonant filter, various LFOs and envelope generators, and so on - in the usual manner. The Quadrasynth contained 16MB of ROM containing PCM-based waveforms and samples, with the option of expanding the sample base via PCMCIA expansion cards which plug into the back of the synthesizer.

A "patch" on the Quadrasynth can contain 1, 2, 3 or 4 of these tones. However, polyphony decreases as more tones are used. For example, a 1-tone patch would have 64-note polyphony, a 2-tone patch would have 32-note polyphony, and a 4-tone patch would only have 16-note polyphony. Patches can only be stored in the User bank. All other banks are factory presets which cannot be overwritten. The Quadrasynth was typical of synthesizers of the early 90s, featuring a digital, menu-based editing system. Editing user patches could be tedious if the user is unfamiliar with its complex editing structure or has not read the manual.

A multitimbral "mix" (or "performance") can contain up to 16 parts (patches). Each part can respond to the full range of the keyboard or to a configured subrange, which allows for layering and splitting. Each patch in a mix corresponds to a different MIDI channel, so that the Quadrasynth can become a multitimbral playback device for external sequencers or MIDI file players. The Quadrasynth also had a 4-bus multi effects processor, which is based on Alesis' own Quadraverb 2 stand-alone effects processor.

Technical Specifications
Type: Digital
Synthesis: ROM
Oscillators: 4
Waveforms: ROM
ROM Size: 16
ROM Resolution: 16 bit, 48 kHz
Osc Modulation: Continuous Controller, Envelope, Keyboard, Knob, LFO, 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
Filter Modulation: Envelope, Keyboard, Knob, LFO, Mod Wheel, Pedal
LFO: 3
LFO Parameters: Noise, Sample & Hold, Saw Up, Saw Down, Sine, Square, Triangle, 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
Alesis Q2 FX processor chip:
Alesis D4 drum module sounds.
Case: Keyboard
Keyboard: 76 keys, Semi-weighted, Plastic
Controls: Aftertouch, Knobs, Mod - Wheel, Pitch -Wheel, Velocity, Pedal - Volume
Audio Output Connections: 1/4" Phone Jack, ADAT, Stereo Main, Stereo 2, Stereo Headphone
Audio Output Count: 8
Inputs: 48kHz Clock, ADAT optical input
DAC Bits: 16
DAC Frequency Rate: 48
Power: 120 AC V
Year Released: 1993
Year Discontinued: 1995
Manuals & Documents

Product Links
Company Product Sites:
[+] en.wikipedia.org
MSRP List Price: $1495 - convert
Retail Street Price: $1399 - convert
Used Price: $80 - $250 - convert

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