Hello I have this pedal too and have experienced similar problems..
If you are using battery power only use Duracell Ultra (or equivalent) never re-chargeable batteries. However I am assuming you are using the mains power adapter rather than batteries.
Start by eliminating external issues. Change your guitar lead and output lead - if you don't have spares swap them over or swap the ends round to make sure it is not a contact issue in the jack sockets.
I found this problem occurred most often when I was using headphones plugged directly into the pedal rather than an amp. I was usually able to solve it by wiggling the output jack plug slightly so came to the conclusion that it was just a poor quality plug or socket.
Having said that I think that there might be a bug in the processor unit itself because I have occasionally experienced the problem when playing through an amp. I resolved it by unplugging everything and starting again but this is a bit annoying either during a gig or half way through a recording session.
Does it do it on every patch or only on some? I have one patch that is completely clean (straight through) with no effects, noise reduction, boost, with the tone set at flat. You could try setting a patch like that up as a comparison and see if it still does it.
Lastly you could try recalibrating the expression pedal.
- Unplug the input jack to turn the unit off.
- Hold down the pedal assign button whilst plugging the input jack back in.
- The display should read 'dn'
- Raise the pedal fully and press the store key
- The display now reads 'UP'
- Push the pedal fully down to the stop and then release it (it will return slightly)
- Press the store key again
- Job done (unless the display reads 'Er' - in which case repeat from step 4)
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