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Alesis S5 QuadraSynth Keyboard

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    Description
    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.
    Images
    Architecture
    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
    Patches RAM: 640
    Patches ROM: 128
    Multipatches RAM: 500
    Multipatches ROM: 100
    Storage: Internal, RAM Cartridge
    Editing: MIDI
    Effects
    Alesis Q2 FX processor chip:
    Reverb
    Delay
    Percussion
    Alesis D4 drum module sounds.
    Case
    Case: Keyboard
    Keyboard: 76 keys, Semi-weighted, Plastic
    Controls: Aftertouch, Knobs, Mod - Wheel, Pitch -Wheel, Velocity, Pedal - Volume
    Connections
    Audio Output Connections: 1/4" Phone Jack, ADAT, Stereo Main, Stereo 2, Stereo Headphone
    Audio Output Count: 8
    Inputs: 48kHz Clock, ADAT optical input
    MIDI Ports: IN, OUT, THRU
    DAC Bits: 16
    DAC Frequency Rate: 48
    Power: 120 AC V
    Production
    Year Released: 1993
    Year Discontinued: 1995
    Manuals & Documents

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