As output level of each programmed patch is uneven, I would like to keep them even.
Please adjust "Patch Level" parameter for each patch to keep the output level even. You can set up total patch level.
Is it possible to turn on/off effect modules by foot pedals?
GFX-4 has a function which you can assign each effect module to foot pedals and turn on/off each effect. This function is called "Manual Mode". Foot pedals of GFX-4 can be just like on/off switch of stomp box. Please refer to explanation of ﾒManual Modeﾓ in operation manual.
Effects, such as "Wah" using expression pedal, do not start.
Expression pedal operates also as an on/off switch for assigned effect by stepping on. Please step on ahead more strong. Refer to "Adjusting the expression pedal" in operation manual. In case of GFX-4, you can set up the expression pedal as exchange switch for "Manual Mode to Program Mode".