“One of the most well-specced polysynths of it’s era.
I’ve had this around 7-8 years but not much time for music nowadays.
It has a couple of problems.
(1) the pitch bend wheel isn’t properly sprung any more. It returns slowly and doesn’t have the right resistance.
(2) when first turned on one of the voice cards is about 1/2 cent out of tune. After being left 20 minutes, the auto-tune/calibration routine sorts it out and it is then stable for as long as needed.
Has a card full of patches in the back memory slot.” Click here to visit listing on eBay
“from estate, has been in storage a long time – power supply is missing, unable to test – unit being sold as is for parts or restore project – no returns, please bid accordingly” 
“Alesis S4 Plus Quadrasynth 64 Voice Rack Mount Synthersizer Module. Condition is “Used”.
“During testing it powered on but would not stay on same channel! This device is defective and non working! Rattling can be heard inside the device! Keys are broken in the front! Unable to pin point what exactly is wrong with device! This device is for parts/repair only! ” 
“For sale is this Alesis S4 Quadrasynth 64 Voice Rack Mount Synthersizer Module. Item is functional and is in excellent condition with light wear from regular use. Listing does not include a power cord, or any other cords and accessories(comes as pictured).” 
” Alesis Andromeda A6 Rare Vintage Polyphonic Analog Synthesizer – Near Mint!. Condition is “Used”. Shipped with UPS Ground. ” 
“Good and typical used condition. No dents. All knobs tight.” 
“Everything (keys, buttons, dials, ribbon controller, etc) works as it should. The only disclosure is that the guy I bought it from said he sometimes had trouble using a memory card with it. I never tried to use a card, so I don’t know for sure if there’s an issue.
“good condition—tested and works good—all keys play good—all buttons work good —includes ac cord ” 
“Up for sale is a mint Alesis Xortex Keytar controller! I bought this brand new a few years ago with the hopes that I would be spending more time on keyboards than behind the drumkit….that didn’t happen. I had it out of the box once or twice to play with it a bit hooked up to my Roland JV-1010…worked fantastic! I just never got to the point where I played keys well enough to take this out and really utilize all the features. It comes with the USB cable, shoulder strap, Abelton’s Live Lite, and all documents. I will pack it well and and ship within 24 hours of payment (except Sunday). ” 
“Complete with flight case, 1 key is slightly raised this does not affect the great overall condition and is in great working order.” 
“Andromeda A6 – Good Condition
“A few of the potentiometers need to be replaced and, I actually have them all but just haven’t been installed yet, I will ship them with the synthesizer. They’re not that bad so, I just haven’t bothered replacing them yet because it doesn’t interfere with me using the instrument. ” 
“Alesis Andromeda A6 Analog Polyphonic Synthesizer. We’re trying to raise some money to help support our recording studio, and as a result, we’re selling some equipment. The synth is in really good shape and it works well. Two of the keys were replaced in 2013, and they are whiter than the other keys, but that is the only flaw. This is a beautiful instrument and a monster of a synth. I don’t have the original box but I do have a box provided by Alesis to fit the synth when it was serviced.”