Hello, did anyone here ever do the following modification to the Roland Jupiter-6: Disconnect R41A (=output of Xmod VCA) from pin 15 IC33 (VCO1) and connect it to pin 6 of IC49AB (=cv summing point for VCF). Looks dead easy in the schematics. Maybe you have to change the value of R41 from 100k to something lower. Florian