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
October 31, 2012 @ 5:34 am
When I first picked it up I was so amazed by it's unique build structure.
da twoof
August 29, 2012 @ 10:28 am
The absolute worst rompler in existence.

I've heard better sounds on some Yamaha Portasound's. My friend bought one for our band when they first came out and I still remember that crushing feeling when we both realized that the filter was NON-RESONANT!

'Drum kits based on the D4 drum module'. Yep - how to make an awful synth even worse...

I would not take one of these if it were offered to me for free. It's that bad.
July 6, 2012 @ 3:54 pm
is anyone else having any issues with the headphones.
i pulled my alesis out and tried to play with it with the headphones with no avale..
i can hear it powering up through the headphones and powering down throught the headphones... but i cant get any sound from the actual keyboard to come out... should i reset it?
April 22, 2012 @ 1:33 pm
@ Al... Yeah!.... it's tuning that's been set. You can re-tune it manually... but it's easier to do a factory re-set.

Just Hold down the buttons numbered 0 and 3 then power it on while you're holding them. It should then boot up into factory fresh state.

Jim Harryman
April 16, 2012 @ 6:41 pm
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.
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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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