I provided the internal drawbar switching signal on PL5 vibrato port pin 6 and 7 which are not used otherwise in firmware 3.925 for mk2. They will provide same select signals as on HX3 mk4 analog inputs. Firmware is online in Github now. See instructions here:
http://wiki.keyboardpartner.de/index.ph ... F12_Boards
Gruß, Carsten aka bovist
Working perfect . Thanks
Best Regards
Roland