Thanks Harry. I doubt that Roger would assign modulation to a foot pedal. And, if the modulation wheel is all the way forward (turned off) it shouldn't matter what setting is used for the controller effect. Maybe it's a language translation thing . . . It doesn't hurt to try though.

On the other hand, if the pot is bad such that the slider is not making good contact it would act like Bill said above. It should be easy for the technician to check these things.