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Sequential Circuits Six Trak

Posted: Tue Apr 02, 2019 4:20 pm
Weird issue with a sequential circuits six-trak. Each preset now has one or more 'dead keys' that seem random and specific to the preset. If you mash enough keys to reach maximum polyphony, the 'dead keys' randomly reassign themselves to different keys. If that makes sense.

What is this?

Re: Sequential Circuits Six Trak

Posted: Wed Apr 03, 2019 11:22 am
by Hyde
Has it ever been opened up for a cleaning/service? Maybe some loose connections or keys not firing properly, scrambling the computer. I fixed my mirage & eps classic, recently. Pulled the keys & found 30+ years of built up "YUCK" causing all sorts of problems. It was a tedious adventure but, they but work like new, now.

Re: Sequential Circuits Six Trak

Posted: Wed Apr 03, 2019 1:56 pm
by meatballfulton
The SixTrak has six voice chips inside, it sounds like one or more of them have gone bad or at least some of the connections to those chips have gone bad.

You might be able to isolate which chips are suspect by going into multitimbral operation, where it works as 6 monosynths. I'm guessing that in this mode, each timbre is locked to a single voice chip so some timbres would be dead and others not.

Re: Sequential Circuits Six Trak

Posted: Thu Apr 04, 2019 12:24 am
Thanks for that! It's recently been serviced but the electrician was puzzled by this issue. I'll quote to him meatballfulton's suggestion and see if that helps!

Thanks again!