I have been trying to get answers on this for about a month now and am at my whit's end! I want to perform (guitar and vocals) live using midi instrument tracks as back-ups. I would like the "live" audio tracks to send midi instructions to both my NI Guitar Rig 3 as well as my Digi-Tech Vocalist Live 4 so that as I play along to the tracks (mostly drums and bass), my outboard effects can change settings automatically. i.e. Guitar effects, vocal settings and lights change according to automation signals from Logic. I was told (or at least it was my understanding), by an "Apple Genuis" yesterday that I would be best to do this via Mainstage. I asked them specifically "I can load my Logic tracks into Mainstage and that will control my effects and play the tracks?" However, in RTFM (Reading The F'n Manual), it clearly states the Mainstage does not send ANY midi signals. Obviously, I'm pretty new to this computer doohickey thing (Macbook Pro 2.2 Ghz) but have used it to process my guitar sound live quite successfully via Guitar Rig 3 (with Rig Kontrol). I'm not a keyboard (piano) guy whatsoever and am really finding this to be quite a daunting endeavor and I'm thinking "This shouldn't be this difficult!" Any help or tips as to where I might find help would be greatly appreciated.