I've been getting into effects lately, and I've indulged and purchased several different effects by different manufacturers in a relatively short amount of time. I've noticed that some of them, when switching the effect on and off, put a very loud pop through the speaker, which is obviously very undesirable for both performance/recording integrity as well as potential damage to the speaker. However, the problem isn't always there... sometimes it's loud as hell, and sometimes it's as quiet as I'd expect it to be. So... do any of you have experience with this on-again/off-again popping? What causes it? Is it more inherent in certain types of effects, certain manufacturers, or certain pedal models? For what it's worth, the most recent offender has been a BJFE Blueberry, although I've noticed this on a few different pedals too. What do you guys think would cause a loud pop on one toggle and no pop on another?