Last time I saw this was non-momentary/non-latching footswitch problem,
sorting out the firmware failing by slowing down the switch action. That
fudge has worked fine. Now guitar input ok but a noise over the
microphone input that is white noise wavering in strength so it sounds
just like buffetting gusty wind noise. No change to the hash on jiggling
anything external. I've recorded the noise and are uncertain whether the
wavering is random or complex cycling in nature. I wonder if there will
be a cure this time, barely 2 years old.