I am opening up a Café/wine bar with a 55 person capacity and wish to install my own in house system to control the quality between various artists that might not have the right pa equipment. The main room is 30 x 40. It will mostly be live music with up to 4 musicians. From folk to jazz and from country to soft rock. I would like to be able to mix the sound remotely (ideally from my Ipad). Finally, up to how many channels can I have with your options?