So here is the result. I decided against the modifications because her in Europe Fender will not sell/send me the needed parts. They stated that for the next 2 years these parts are for warranty only. For people with a longer breath to deal with Fender here are the partnumbers of the LBXII Dual Concentric Potmeters and the dual knobs. Volume - 7709932000 - 1M 30A DUAL D-SHAFT Gain - 7709931000 - 250k 30A DUAL D-SHAFT Inner White Knob - 7710822000 Outer Black Knob - 7709933000 Those 1 Meg Dual Concentri Potmeters are very very hard to get. For now I have solved the Green Blue Volume problem with a MIDI controlable ZOOM MS-50G in the Loop. Maybe over 2 years will try it again.