The three sysex files contain presets to edit the Sequential Circuits 6 Trak patches using the Peavey PC1600. These sysex files must be dumped one by one to the PC1600 using any sysex utility. The 6trak.wrk is a Cakewalk Pro Audio file that allows you to name each of the 3 banks, as well as edit their parametets. 6trak-1.syx uses sliders 1-16 on the PC1600 to edit params 0-15 on the 6 trak. 6trak-2.syx uses sliders 1-16 on the PC1600 to edit params 16-32 on the 6 trak. 6trak-3.syx uses sliders 1-16 on the PC1600 to edit params 33-35 on the 6 trak. Button 1 in all three presets enables ALL midi/send receive on the 6 trak. (this duplicates the pressing of Control-Record Select 4 on the 6 Trak) Blank.syx is an empty preset for the PC1600. It has been edited for the minimal amount of memory consumtion. Occasionally the PC1600 runs out of memory, even though the utility page tells you that there is some available. When this happens you CAN'T save ANYTHING, and you can't delete anything. The only way around it is to dump all your presets via sysex, then reinitialize the factory settings, then reload your presets via sysex. To help avoid this, copy this preset to ALL your unused presets on the PC1600 to free up memory, and avoid losing the ability to save some critical data. If you come up with any additions to these presets for the PC1600-6 trak send me email at newshirt@best.com Tony