thanks for all your suggestions!
further investigation revealed that it seems to be necessary to re-program one of the chips with CC++ or similar in order to make it possible.
I've got the Whammy 4 and it is midi controllable but I wouldn't actually need midi control if I have everything on board, would I?
I'd just like to play solos with the pitch shifting effect by turning a knob on the guitar. I imagine it being a lot more precise than using a pedal.
the midi strip found on manson guitars as the black and the bomber one is just able to control the unit, which is outside the guitar.
also, it only switches between the effect "presets" and is not able to affect the actual pitch like you do with the pedal.
hmmmm, maybe I really gotta put something other inside.
btw I'm not building it myself, I'm a noob at that, I get it made by a guy oversea in the US.
still I can't understand why its not simply possible to take all the inside of the Whammy that is necessary, put it into the guitar, wire here wire there knob and finished?