Sequential Circuits Six-Trak with Commodore 64 Sequencer

via this auction
SN 001213
"Included with this Six-Trak is the now outdated Sequential Circuits model 64 sequencer cartridge that plugged into a Commodore 64 computer, and the associated software on 5.25 inch floppy disks. Because of the age of this software, and the obsolete format, there is no guarantee the disks and cartridge still work. The 2 MIDI cables are good.

In the yellow 3-ring notebook are:

Six-Trak Model 610 Operation Manual
Six-Trak Expansion Software Operation Manual
Maestro Music Voice Programs for the Six-Trak (parameter settings)
Adrien Nash Professional Programs for the Six-Trak (parameter settings)
Parameter settings for original 100 factory voices."