“Sequential Circuits Six Trak Analog Synthesizer Model 610 49-Key Keyboard.
6 voice polyphony and a looping real time sequencer make this synth super fun to play around with.
I just tested every key and button all of which are in working order.
It shows its age a bit, but its in pretty solid condition for an instrument from 1984.
This is one of the first synthesizers to implement MIDI.
MIDI sequencing I/O is supported but not all MIDI message types were established at the time of release.
Comes with 2 alternate firmware chips.
One of them is the same as the installed chip (sixtrackv9p) and one is an update (sixtrackv12).” Click here to visit listing on eBay