...old thread but I’ll offer up anyway ....I installed V14 rom in my Sixtrak, new LFO parameter and patch selection via pot worked fine yet the midi was all over the place , totally unusable so re installed the original rom- V9M- and midi back to working as it should . In the process I reacquainted myself with the procedure for setting up 6 mono voices which is :- press track record plus 4 button-in control section- press control record plus 1, press control record plus 4 . This sets up the synth for 6 mono voices although you require an external midi equipped controller to program midi channels and individual voice programs , I’m using an Evolution midi keyboard . As to the six track arp , I control mine externally with the gate out of an MC202. I program an arp pattern into the Sixtrak then turn the arp speed to zero then insert a jack-coming from MC202 gate out -into the foot switch jack .Sixtrak arp now triggered via gate out of 202, this requires mini jack to jack lead .