It can be used on AC, and I assume the battery charges at the same time.
The FX worked for me, right out of the box.
I haven't tried the USB, and can't imagine a situation where I would want to use it.
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Mike
My music: https://mikebirchmusic.bandcamp.com
2020 Taylor 324ceBE
2017 Taylor 114ce-N
2012 Taylor 310ce
2011 Fender CD140SCE
Ibanez 12 string a/e
73(?) Epiphone 6830E 6 string
72 Fender Telecaster
Epiphone Dot Studio
Epiphone LP Jr
Chinese Strat clone
Kala baritone ukulele
Seagull 'Merlin'
Washburn Mandolin
Luna 'tatoo' a/e ukulele
antique banjolin
Squire J bass
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