“Amazing multi-timbal polyphonic analogue synth built in 1984 by Sequential Circuits, with MIDI, on board sequencer, arpeggiator and monophonic unison mode for nice thick sounds. If you’re looking at this listing you probably already know what it can do, but check out this post http://www.vintagesynth.com/sci/stk.php or have a look on YouTube for videos of it in action.
Bought it from my friend a few years back as it needed some TLC and he wasn’t using it, so took it to Synth Prof (synthprof.com) for a full MOT and UK mains conversion, which cost £225 around 2 years ago (if you need specific details of the work that was done I can email Andrew at Synth Prof for more info).
Some minor marks on the wooden end panels but nothing more than you would expect from a machine of this age. Otherwise has been looked after well and not used very often in a smoke free studio.”
“PHYSICAL CONDITION: Good – There is a 4″ strip of wood missing from the top part of the right side panel. There are light scratches and scuffs all along the sides of this synth. All the LEDs light up as they should. All the pots rotate nicely. The master volume pot/knob wiggles slightly from side to side compared to the other knobs. All the push button feel good and the I/O jacks on the back are solid. The keybed’s fast, light action feels great and the keys are level with each other. All the keys are fully intact with no major chips or cracks to speak of except for the Bb/A# key to the left of the middle C which has an extremely small blemish near the middle. The power cord is in great shape with no tears to speak of. Overall, this synthesizer is in good physical condition WORKING CONDITION: Excellent – Works like a champ! All keys, all control knobs, all buttons, all LEDs, both pitch and mod wheel as well as all I/O are working perfectly! Overall working condition is excellent” 
“Listed as parts. Functional with really strange behavior. Won’t stay in tune. Constant drift and really not sure what’s going on. Patches all sound really off. Swapping voice chips did not resolve this. Currently has ROM 11. Some scratches are shown on the top panel. Two side screws are missing but does not affect stability.” 
“Excellent condition! New OS chip.” 
“I bought this years ago to restore and just repaired the power supply temporarily, as you can see by the wire nuts. It turns on and makes some cool sounds but clearly isn’t working well. To be safe I am selling it as not working, for parts, but many lights come on and buttons react, and keys make sounds.” 
“Good working condition.” 
“This is a very nice Sequential Circuits Six Trak synthesizer unit that was part of a clean, smoke-free home studio. Used sparingly. It works well and is in excellent cosmetic condition.” 
“Sequential Circuits Six-Trak in great condition!
“This item came from a estate sale. It is in very good cosmetic condition. It’s power on. I don’t know how to test it. It might work or it might have issues. I am selling this for parts or repair to avoid any potential issues. If it turns out to work, lucky you. SELLING AS-IS, NO REFUNDS!” 
“This unit is in almost new condition and works flawlessly. This is a great and rare find.
” We purchased this a number of years ago (over 20) and used it in our little home studio and unfortunately is not working at present. Not sure of the repairs needed – we are just trying to clear things out so are selling this classic unit as is. It is clean with not much wear showing but alas, it is non-operational.” 
“This unit has some minor cosmetic wear and tear from over the years. A little on the face plate and some on the wooden side panels. Please see all photos. Overall is a really nice synth and minor cosmetic wear does not detract from usability.”
“This is for a used Sequential Circuits Six-Trak Vintage Analogue Synthesizer. The body is in decent shape has some nicks and scuffs as shown in picture but nothing major. Keys work perfectly, sounds awesome. The speed knob works fine but i think it has been replaced as it’s a little wonky but still works fine(right knob shown in picture) The 6 key works but sometimes needs to be pressed hard and last-the rubber around the end of the outlet plug is starting to degrade as shown in picture. All that said still works good and sounds amazing.” 
“This Six Trak is in very good condition and working perfectly. All controls have great feel and respond accurately. All lights fully functional. All ports and jacks in great shape and connect without issue. Sound is strong and clear. Keys straight and play nicely. Some scuffs and dings on the wood end panels and general signs of age, but overall in very good physical condition. ” 
“I’m selling my beautiful Sequential Circuits Six-Trak. This unit has a few dings and scratches due to it’s age, but as you can see in the pictures, it’s gorgeous. All functions and lights on this synth work great. It sounds great too! I’ve programmed some patches on it, but the rest are up to you” 
” Six-Trak Sequential Circuits Synthesizer Keyboard. This unit has a few dings and scratches due to it’s age, but as you can see in the pictures, it’s gorgeous!!! All functions and lights seem to work on this synth and it sounds great too!!!” 
“In like-new condition, except for minor crack in power cord where it meets the unit(pictured). Never gigged. Original owner. All documentation included. Original flight case included.” 
“This Six Trak is in very good condition and working perfectly. All controls have great feel and respond accurately. All lights and screen fully functional. All ports and jacks in great shape and connect without issue. Sound is strong and clear. 
“This unit is used, but it is fully functional and has been recently serviced, has new battery for the memories which will provide years of trouble-free service. The power supply capacitors have also been replaced to ensure quiet operation.
” A very capable synthesizer with 99 presets, full parameter control, 6 voice polyphony w/unison, simple classic design, and a six track sequencer built in to the synth! ” 
“This Vintage Six-Trak Synthesizer is fully functional and in Very Good to Excellent Condition. The synth has been well taken care of with all knobs and pads intact. The wood side panels and keys are clean. The keyboard will come in a RoadRunner Flight Case measuring 29 x 18 inches. ”
” Sequential Circuits Six-Trak Vintage Analog Synthesizer. In excellent condition. Everything works on this synth. Volume control is clean, no noise at all…. Thanks for looking!” 
“Six-Trak Synthesizer – Everything works and is in Very Good Condition. Midi settings all set to factory settings using the midi ports. This synth has been well taken care of and all knobs and pads feel like they have experienced low use. The wood side panels are in great shape and the keys are clean. The Inside shows no sign of repairs or abuse. Clean inside and out. Please see the photos. ” 
“lots of very very cool sounds on this thing, from Emerson Lake and Palmer, To 80’s dance.
“Free Shipping on this old vintage synth. been sitting unused for a long time. powers up, its keys work, the programs can be edited and altered. some of the keys (on some patches) sound sharp or flat, with other matching keys. tuning issue? some great patches, both wheels work. all the buttons produce. sounds on this thing can take you back 40 years. some sounds Like Emerson Lake and Palmer. chip in the wood, on the left side panel. sold as is due to its age, and being electronic item. ” 
“Up for auction is my 100% fully functioning Sequential Circuits Six-Trak. It shows relatively minor wear considering its age (see pics). It comes with the original manual.” 
“here im selling the sequential circuits six-trak in very good condition almost without any mark on it
“This Vintage Six-Trak Synthesizer is fully functional and in Very Good to Excellent Condition. The synth has been well taken care of with all knobs and pads intact. The wood side panels and keys are clean. The keyboard will come in a RoadRunner Flight Case measuring 29 x 18 inches. The case has some dings but has kept the keyboard protected. Please see our photos. ” 
” Due to emergency, need to sell some synth stuff. Up for auction is one Sequential Circuits Six Track Synthesizer. This synth is functional and sounds beautiful, but has some issues. First, the rubber chicklet buttons are terrible, they should be replaced. Sometimes you can get them to work. Second, the power switch is stuck in “ON” position. Good news is it also comes with some extras. This auction includes the Sequential Circuits foot pedal switch. This switch is a helpful assist to work around not having to use some of the very finicky buttons. This unit has been upgraded with the Wine Country IC, so it handles standard MIDI. I’ve included the original chip in the tube the upgrade came with. I’ve also included some other Wine Country paperwork and a new capacitor. Despite the issues, I know this machine makes beautiful sounds, but due to personal emergency cannot test all other functionality and this synth is being sold “AS IS.” Thank you.” 
“This unit is in great condition.
” here im selling the sequential circuits six-trak in very good condition almost without any mark on it
” here im selling the sequential circuits six-trak in very good condition almost without any mark on it
“This is a 1983 Sequential Circuits Six-Track six voice analogue synthesizer. It is one of the first analogue synths to include MIDI in and out and has 64 preset sounds. It has six voices that can be stacked individually as well as plays with six-voice polyphony. I am including the original manual. Because of it’s vintage nature it is being sold as is. Everything is tested and working.” 
“For sale is a Sequential Circuits Six-Trak analog synthesizer. Cosmetically the synth is in pretty good condition considering it’s age with only minor scuffs and blemishes, however whenever you throw midi at it it begins to act up, either dead voices start appearing or it cuts out completely until you resit the battery. For this reason it has to be under for repair.” 
” Sequential Circuits Six-Trak Model 610 Vintage Analog Synth with original manuals and guides and Evolution UC33 USB/MIDI controller