In fact, if the fx switch is global, you should make the volume knob global as well because fx on or off can impact the volume a lot, for instance reverb makes the sound quieter, compressor can make it a whole lot louder. Not to mention that some patches are way too loud to begin with.
Possible solution: I would make the fx switch per patch by default, and add a Global item in the settings, where one can choose from the four options None, FX, Output, FX + Output.
On the GUI what is global could be indicated by bright red lighting (instead of amber or blue) or a little red lock symbol at the FX switch and Output knob.
