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piezo pickup = earth loop nightmare!

Hi everybody

newbie here :oops:

just joined up to "pick your brains"

I have just got myself a piezo pickup for my kalimba - if I plug it into my bass amp, or effects chain, or into the 1/4" jack mic input of my BOSS loopstation, I get a dreadful earth hum. this can be fixed by attaching the casing of the amp, or the casing of the cable, to the body of yours truly.

dbx 163 hook up to a Tascam 388 effects loop

I was wondering if anyone knew how to hook up a dbx 163, (the one with the wood panels and the single slider), to the effects loop on a Tascam 388. I never hooked up a unit with a single RCA jack for input and output. I need to compress a couple of tracks on the 8 track, but don't really want to compress the whole mix if I don't have to. I am mixing down to a 22-2. Any help would be great.