Up for sale is a classic Sequential Circuits Six-Trak in very good aesthetic and functional condition. This vintage multi-timbral powerhouse has been fully serviced to ensure it performs reliably for years to come. Most notably, it has been upgraded with the modern Tauntek v14 OS EPROM, which fixes long-standing MIDI bugs and drastically improves the synth's responsiveness to CC messages—making it a breeze to integrate with modern DAW workflows or external controllers.

Highlights of this Unit:

• Fully Serviced: Cleaned, tested, and calibrated for optimal performance.
• Tauntek v14 Firmware: The essential modern update for improved MIDI functionality and smoother parameter control.
• Classic Sequential Sound: 6 real CEM-based analog voices with that unmistakable 80s warmth and grit.
• Multi-Timbral: Features the famous onboard 6-track sequencer and "Stack Mode" for massive, layered leads.

Work Done: Tauntek OS v.14 Upgrade Installed, old PSU replaced with a fresh NOS official one from Wine Country before they closed up shop forever. Refreshed carbon contacts of all rubber buttons and keys. All old, leaky/suspect diodes replaced. Electrolytics recapped. Replaced ICs that are prone to fail after 40+ years (especially the multiplexers and demultiplexers in the DAC/ADC Circuit that direct all the traffic. Memory and sysex communication working perfectly, fresh and clean battery (3.3v tested). Reflowed any suspicious 40 year old solder joints. All pots cleaned and refreshed to ward away scratchiness. Methodically inspected and tested to ensure all functions are performing as they were when it left its assembly line in 1984. Actually, you could say this unit performs even better than brand new due to the Tauntek upgrades!

This Sequential Six Trak has gone through all its paces and maintenance so that it may continue to inspire and entertain for another 40 years and beyond...

Some Features of Tauntek v14 OS Upgrade :

1. Unison Detune: Added functionality for thicker mono sounds.
2. Value Pot Navigation: In Program Select mode, the value pot now scrolls through programs (0-59 and 40-99). Patches can still be selected via the keypad as usual.
3. LFO Syncing: A new global parameter (Front Panel #37 / MIDI #39) allows the LFOs to sync to the start of a new note (resetting to no modulation, full modulation, or normal behavior).

MIDI Stability: Addresses various system code issues to fix the timing hiccups and clock sync jitter notorious in the original release.

Embedded in this listing is a brief demo video of this Six Trak showcasing its full functionality and to demonstrate its impressive and groundbreaking (for its time) multitimbral/proto-groovebox abilities.