Alesis QuadraSynth

Alesis Quadrasynth Image

The QuadraSynth was introduced in 1993 by Alesis, and it was their first major synthesizer. It's a 64-voice, 76-key digital synthesizer that also came in a rack-mountable version: the S4 Sound Module. It had a whopping 16 MB of sample ROM, and was the first synth to offer the ADAT Optical Digital interface. It also featured the same multi-effects processor as the QuadraVerb 2, drum kits based on the D4 drum module, 4 assignable control knobs, one PCMCIA card slot, 48kHz clock input, and 4 audio outputs.

The QuadraSynth is undoubtedly a powerful and flexible synthesizer capable of creating rich sounds - both acoustic and electronic. It uses digital additive/subtractive sample playback synthesis to create high quality stereo grand pianos, organs, strings, drums/percussion, brass, woodwinds, new and classic synth textures, and more.

Released in 1995/1996 came the new and improved QuadraSynth Plus synthesizer. The QuadraSynth Plus has more ROM (24MB expandable to 32), many more program patches (640) and mixes (500). The General MIDI library has been added, as well as an 8MB stereo Grand Piano sample (also found in the stream-lined QS7, QS8, QS6.1, QS7.1, QS8.1 and QSR models), and a PCMCIA expansion slot. For an all around versatile modern synthesizer that isn't focused just on dance or trance, be sure to consider the QuadraSynths.

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32 Visitor comments
May 31, 2014 @ 2:54 pm
Hi all. Can I take an EPROM from a qsr and put it in my original quadrasynth? I need to do an upgrade to get to s/ware version 1.07 or greater.
January 21, 2014 @ 9:09 pm
If you're in the market for a Quadrasynth/QSX, forget about doing anything with it's acoustic instrument sounds. They're pretty bad, esp. by today's standards. That being said, the Q's are actually capable of producing some very cool & interesting synth/analog type sounds, especially with Vintage Synths & Eurodance Q-Cards. I've own a QSR for 13 years & it's been a dust collector. Only last year when I really started playing w/it (& grabbed some Q-Cards) & making customs sounds, did I realize & start utilizing it's true potential. It's a limited synth, so be aware of what you're buying.
September 3, 2013 @ 7:22 pm
Terrence Dixon produces with this.
July 28, 2013 @ 11:55 am
"I have a quadrasynth that works great. I was the lead on the keyboard manufacturing line at Alesis in Culver City in '93. Im selling it if anyone is interested."

hahaha, this says it all. so it really is that bad.. even those people made it don't wanna keep it.
March 23, 2013 @ 5:33 pm
The UGLIEST keyboard ever made. Remember seeing it for the first time back in '97 - thought I was having a nightmare lol. Another one of those "what the hell were they thinking" moments
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  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 64 voices
  • Oscillators - 48kHz Linear samples
    QS: 16MB, expandable to 24MB using PCMCIA ROM and RAM cards
    QS Plus: 24MB, expandable to 32MB using PCMCIA ROM and RAM cards
  • Multitimbral - 16 parts
  • Effects - 4 On-board effects, based on the Alesis QuadraVerb 2 FX processor
  • Arpeg/Seq - None
  • Keyboard - 76 velocity and aftertouch sensitive, semi-weighted, synth-action
  • Memory - QS: 128 preset 128 user programs, 100 preset, 100 user mixes
    QS Plus: 512 preset 128 user programs, 400 preset, 100 user mixes
  • Control - MIDI IN/OUT/THRU (16-channels)
  • Date Produced - 1993 (QuadraSynth)
    1995 (QuadraSynth Plus)
  • Resources & Credits
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