I have a Mission Expression Pedal and a Source Audio Expression Pedal and have tried both with the FBV 3. All they seem to do is adjust amp gain, at best. Is there any way to assign the external controller to say pitch? I saw another thread where it seemed all you can do is control volume with the second pedal. If that's the case, then the additional external pedal input on the FBV 3 is pretty much a total waste. I'm hoping I'm wrong but I can't seem to find anything to explain the function of that additional expression controller input. Thanks for your help.