I use a jamhub for rehearsals and have used it for monitor mixes live using modified stereo cables and the inserts on each channel on the desk. Great bit of kit and if you already have the isolation headphones, drum mics into a small mixer for drums or electronic drums, low wattage guitar amps that the 'sweet spot' isn't at 120db with a good quality mic in front or palmer speaker sim for each guitarist or a modeling amp as well as in ears. It's not a cheap way of doing things and you probably won't need all of it but it'd really help