The guitars are both going through it's own Boss ME-70 multi effect with preamp. Also the bass is going through a effect-box with preamp. Do they still have to go in a preamp input in a 18i8 or 18i20 ? If so, the 18i20 is the way to go. I thought since the guitars and bass already have preamp, it was to go in to the input on the backside of the 8i18 without the preamp ?
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