via this auction
"Although typically understood as a slimmed down entry level offering from Sequential Circuits, the Six-Trak has the distinction of being one of the first multi-timbral MIDI synthesizers. Like the name says, the built in sequencer can access all six voices individually for easy stand alone composition. This Six Trak, sn 004789, is the cleanest one we've ever seen, from the original owner, with the original receipt still intact. There is one blemish below the keybed on the right side of the synth, otherwise all is clean, tidy, and sparkly. Additionally, we had this synth serviced, in order to have all the dust blown out of the potentiometers and the key contacts cleaned. This synth includes the original box with all the original packaging, the manual, and the laminated front panel guide. This is the finest Six Trak to ever come through Synth City, so take note, and contact with any further questions."
