We have a 4 piece band and we're thinking about using Logic and Mainstage as our primary live performance controller. When we play live we use 4 Bose L1 Model II's Personal Amplification Systems (PAF) to amplify all of our instruments and vocals (i.e. 1 Bose for each band member.) Initially, we thought we would simply have backtracks recorded on an iPod with the instruments panned to one channel and the clicktrack to the other, then run the instrument channel through one of the Bose Systems and the clicktrack to the drummer's earpiece. Then we thought it would be great if we could separate the tracks and run them to the corresponding Bose system. For example, vocal backtracks would be amplified through the vocalist's Bose PAF, guitar backtracks through the guitarist's PAF, keyboards through the Bassist's PAF, and percussions through the drummer's PAF. In addition, we thought it would be great if the clicktrack was fed to the guitarist and bassist's earpieces as well as the drummer's. Indeed, this can be done using Logic Studio and an Audio/Digital interface with at least 6 outputs. However, can this be done using Mainstage 2's new "Playback" feature? The reason we want to use Mainstage instead of Logic Studio is because we want to also use Mainstages' performance features like its guitar rigs for our live guitar. This brings up another question: can you control more than one performer instrument at a time with Mainstage. In other words, can the guitarist, bassist, vocalist, and drummer all use Mainstages' performance rigs at the same time, or does each musician have to use their own separate computer running Mainstage? In the long run, we also would like to use Mainstage to control our lighting and/or videos along with the backtracks and live gear. Is this possible?