I have a Fender Mustang III V.2 amp which is a modelling amp with USB in/out, dual XLR (stereo) out, and an FX loop.
I also have a Mackie ProFX8V2 mixer which has four XLR inputs as well as 1/4" inputs.
I'm as green as can be as far as recording and confused about the XLR inputs on the mixer...