I have been given a Peavey XRD 680. It has some things I do not understand. There is a main, mon. and efx output on front that don't seem to supply a signal to the speakers. The operating guide has some drawings in it that show equalizers and power amps being added to give operation to monitors and othher speakers. I am new at this and could use some guidance. We are trying to make this system into one that could be used for movie nights, meetings and small musical groups, anything big we would hire a sound person with some equiptment. Thanks for the help!!