Hi, I'm just getting started in Mainstage, and wish to use it as an effects pedalboard add in. I have a small pedal board, and will insert the signal loop in via a BOSS LS-2. Got a bunch of questions being a newbie... http://www.bossus.com/gear/productdetails.php?ProductId=150 Using a MacBook Pro 2.66 GHZ core 2 duo, and 8 MB Ram & mainstage 2.13. I have 2 different Audio input interfaces to the Mac - Presonus Firebox, and an Apogee Jam (will be experimenting what's the best). Is the headphone out good for this purpose on my mac? Any known gotchas I should look out for? Also, I'm finding I really don't know how to use Mainstage for setting it up - can someone lead me to a good tutorial? I don't want to add any amp simulation, just effects, and perhaps a looper for playback/play along. Also, does anyone know why Mainstage seems to be hogging up CPU? Should I be in 64 bit mode? Logic Pro runs so much smoother/optimal. Thanks for any links or tips anyone may have!