Any unit that retains a memory after shutting it off has a battery...
Or some kind of nvram like a flash chip.
Yeah I know, I'm just playing devils advocate... Flash or similar chips with such a small capacity (a few k or even a meg) could be integrated right on the circuit boards, and should cost pennies - WAY cheaper than batteries, so I'm kinda surprised it hasn't moved more in that direction.
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. I kno the battery must be sumwhere inside the mixermaybe this is too easy, but while it's open, see if the effects circuitry is separate.
if it is, and it has its own ribbon cable, make sure it's tight.
i guess there'd be a good chance that something like that could come loose on a mixer that gets moved about a bit.

Any unit that retains a memory after shutting it off has a battery Dr. V.....Ive changed many a Yamaha SPX 90 battery. You only get 3 to 5 years out of one and sometimes you luck out and get 7 to 10 years ---with good behavior.
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but that wouldn't explain the noise and also, although it wouldn't retain previous settings, the effect should still function once you select new settings.
I'm gonna be surprised if changing the battery fixes it.
have you spoke to behringer? they are generally very decent with their equipment and could maybe offer a solution??

well ...... I'm not saying you shouldn't ..... it won't hurt anything but I don't think it's gonna solve your current problem. The noise could simply be a dirty pot in which case you're still gonna need to get to that side of the circuit board.Think ur suggesting not to change the battery right lolzz, i still cant find the battery yet. all the ribbon wires r fine ( the effect itself has a lil square panel by itself sitting right underneath the digital preset box ) and all the wires are secured.
I wonder if the battery is on the top of the mixer sumwhere underneath those control buttons (EQs, etcs,..)
Just saying hi there to be sort of nice I guess.but that wouldn't explain the noise and also, although it wouldn't retain previous settings, the effect should still function once you select new settings.
I'm gonna be surprised if changing the battery fixes it.