The QuadraSynth was introduced in 1993 by Alesis, and it was their first major synthesizer. The S4 is the rack-mount version of the QuadraSynth. It's a 64-voice digital synthesizer with 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 S4 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 S4 Plus version (pictured). The S4 Plus rack module came with only 20MB ROM, losing the coveted 8MB stereo Grand Piano sample found in the QuadraSynths in favor of 4MB of General MIDI pianos. For an all around versatile modern synthesizer module that isn't focused just on dance or trance, be sure to consider the S4 or S4 Plus.

Vicious Lee

February 24, 2012 @ 5:51 pm

I have owned one (S4) since 2002 and have had no problems out of it. Got it for $150 in Boston, MA across the street from Berkley School of Music Theater.

Raul

February 18, 2012 @ 11:02 am

Swen - I have a new one ( used for one demo session then stored) . Check under MacCorporate in e-bay
you can contact me at maccorporate@mac.com

Swen

November 11, 2011 @ 5:42 am

As far as I know the Nanosynth is exactly the same as the S4+ minus 3 Effect Processors, ADAT connection, the four knobs and the card slot. I'm out for a S4 for quite a while now, but they are seldom seen on the german used market. But I own a Nano
What I wanted to add is, that the Quadraengine has a very complicated synthesis, definitely superior to Rolands concept, but the filters are really unimpressing and editing a pain, instead you get tons of Env's, LFO's and the really good FX (for its time). I want one because of the ADAT connectors, to get the sounds into my PC.
Big Shot, that one.

bosshog

January 18, 2011 @ 12:59 pm

I'll have to agree with planetplayer, above. As a user of both the S4 and the S4+ i have to say that the S4 sound much "cleaner" than it's big-brother, the plus model. Of course, having the possibility to use soundbridge and burn your own cards on the + is an advantage. Still, if i had to choose between them, i would take the S4 every day.

Randy

January 1, 2010 @ 10:39 pm

Nice sounding unit! The screen is large and gives tons of info for editing the patches. The 4 parameter control knobs are much nicer to use the buttons on some other units. The pianos, organs, strings and pads all very deep and rich sounding. I have several synths and if this one broke, I'd definitely replace it! I scored mine on ebay for about $150 - well worth it! Very easy to navigate, The unit has 4 preset banks of 128 each (bank 4 is a GM bank) and 1 User bank of 128. Lots of effects and flexibility - If one is available and in your budget, don't pass it by!

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