I have an analogue delay pedal, and recently I've been getting random pitch shifts while playing with it on. Can anyone explain why this is? Is the pedal messing up or this a natural thing to happen with delays analog or otherwise?
When altitude dropping, my ears started popping. One more red nightmare...
Seems like something is wrong with the "delay time" pot.

Also, what is your pedal exactly? Does it affect only the delayed sound or the original too?
might be just the potentiometer is acting up

might be a bad capacitor or something somewhere screwing up the digital clock for the delay line

might be the actual clock chip gone bad