Prophet 600 runs well with z80 installed. With teensy++ 2.0 and gligli v2.0 or v2.1 installed I get osc a when mixer pot is turned to osc b and I get osc b when pot turned to a or b, in preset mode and manual. All other controls seem normal. Refitting z80, everything is back to normal. Have upgraded teensy firmware via sys ex, sent fresh presets in. Am sourcing a fresh teensy, this is my customers machine and he supplied it. Do you have any suggestions?