a charge pump takes the input voltage & converts it to a higher level for internal use - something i wouldn't be surprised to see in a small, pedalboard friendly amp. for whatever reason, they can cause noise issues (heterodyning?) especially with certain digital pedals. not sure if design change in the charge pump or the digital pedal or both is necessary to alleviate that issue, but when it exists, the two (or more) pedals are essentially unusable together (although sometimes, i think, putting them on separate/really well-isolated power supply lines can help? (people who know about this...help?)....
But i don't think i read a description of your noise issue, and i forgot to ask - is it hiss? other white noise? crackling? whining? radio interference?
heterodyning is a persistent whining sound....
Of course, if the thing is as gainy as you're perceiving, and the noise is hiss/white, that could just be gain-related and maybe the inability technically/economically in a tiny (and cheap, i assume) mooer amp to implement effective noise-quieting measures....
google shows results for both whining and hiss with the Baby Bomb, and, yes, suggestions to upgrade the supplied psu (24v 2a) which Mooer customer service, lol, admits is cheap and a source of troubles (better that than it's the pedal design, right Mooer?
)
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