Strange volume / tone issue on CU22 Piezo

[rwandering]

I have a 2021 CU22 Piezo that plays and sounds great. Last night I was at an open mic and was getting a really tinny sound out of the "mix" output and nothing I did changed it. In the moment, I chalked it up to something wrong with their mixer setup, and I plugged the same cable into the Piezo output and it sounded fine. (not great troubleshooting on my part, but people were waiting on me to play).

This morning, I plugged it in to check it out and everything was good and just moved on. But tonight I grabbed it to practice some things and found it again sounding kind of weird. Note, I first swapped to a new battery. But I noticed some weird behavior, and this is not meant to be exhaustive:

It seems to happen as a result of my flipping the mini-switch to an electric position (i.e., not the pure-piezo).
When it happens, the electric volume pot does nothing whatsoever. I can go to zero or go up to 10 and the volume is the same.
It seems like the way to solve it is (maybe) to leave it unplugged for a bit. Removing the battery is not a solution on its own.

So, something messed up in the circuit board?

Anybody experience this?

edited to clarify that is the electric volume pot that is acting really weird, not the mix pot.

 

[veinbuster]

Hard to say.
First off, with the mini toggle at electric, the mix knob won’t do anything - it’s out of the loop.
Long shot, but a local shop trying my HB piezo to decide what it was worth to them assumed the electronics were broken, but reality was they had tone turned down which dramatically reduces output if the volume knob isn’t near max.

 

[rwandering]

Thanks for the response, I'll play around with it more to try to diagnose. I did edit my post to clarify that I'm talking about the electric volume knob acting weird, not the mix knob.

 

[JeffsRealm]

Just another thing to think of did you use the exact same battery when you changed it. Different battery brands, even same battery brand but different type like the new extended life, etc. Duracell original coppertop vs the Duracell optimum for example these optimum are flooded all over now and look exactly the same but are not. Found this out with a simple flashlight. I had a super bright flashlight I take camping all the time, just grabbed the optimum, the flashlight was super dim barely working. Which I was ticked off these were new batteries, bought another pack later at different store, same issue. Had some old copper top in a drawer put them in and flashlight was just fine. Put the batteries in something else and they were fine too. These can and do make a difference. Sometimes rechargeable batteries as well also do not supply correctly. I only mention it because you said you changed the battery.

 

[rwandering]

Thanks, I will try a regular Duracell later today. That would be awesome if it were just battery brand.

 

[rwandering]

No luck with a Duracell, so I'll go the PTC route.