I use a Zoom MRS802 multitrack which I simply plug my Mic (Rode NT1a) and guitars straight into. The zoom has phantom power for the mic and a dedicated High Z imput for guitars. What I would like to do is use an external mixer so that I don't have to keep plugging and unplugging mics and guitars from the zoom unit - it will also give me far better monitoring possibilites. My question is.... I assume a mixer will have a preamp for a mic and guitars, so would I need the phantom power turned on on the zoom unit? Also would the guitar signal routed through the mixer still need to go to the deicated High Z input? Any help greatly appreciated.