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Garageband Has No Midi Control Support? Help!

I own a Edirol PCR Midi Keyboard Controller and am trying to figure out if the knobs and sliders can be programmed to different GarageBand functions and can't seem to find a straight answer anywhere! When I asked an Edirol rep if they were going to come out with a control map for GB I was told no because GB has no Midi control support. Wouldn't it have to have some sort of support since I can play notes and use the bender? A member of the Apple forums said that he was able to do it with the PCR Editor and wrote: I figured out how to remap common control commands to the knobs and sliders using the PCR Editor!
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Channel Mode Messages

The last voice message is Control Change, and these are specifically linked to the Channel Mode Messages. When a Control Change message goes out, it is specifying one of the 128 different Channel Mode messages, which globally direct specific functions of the data.  The most important ones to remember are #0 (Voice Bank Selection), #1 (Modulation Values), #7 (volume), #10 (panning), and #64 (sustain).  Controllers 120-127 are also very important, for they specify the mode of the keyboard.  These are All Sounds Off (# 120), Reset All Controllers (#121), Local On/Off (#122), All Notes Off (#123), Omni Off (#124), Omni On (#125), Mono On (#126), and Poly On (#127).

I tried doing this myself but had no luck being new to midi. Does anyone know if he is correct and this can be done? I'm actually interested in using the knobs and sliders for different functions but these maps would just change the sound? If anyone can tell me the exact midi capabilities of GB I will be forever grateful! Any feedback greatly appreciated! Please help!

Plese Help Me With My First Set Up!

I have recently purchased a PCR-30 Edirol Midi Keyboard Controller, a US-122 USB Audio/Midi Interface, and a pair of self powered speakers by M-Audio to use with my Powerbook. I am using Garage Band to get started. The keyboard can be powered via USB or though the AC adapter and the interface is powered strictly by USB. When I hook the keyboard up via USB I can control the virtual instruments on Garage Band but when I run the keyboard through the interface I can't. The Midi In light comes on telling me the interface is getting the signal but it doesn't make it to the computer for some reason. The interface features direct monitoring but I suppose that that doesn't matter when you are using virtual instruments? What is the function of midi in on a keyboard controller? I have donwnloaded all the latest drivers and also set the input and output to the interface. I suppose I could just run the keyboard into the computer via USB and run the audio via the line output of my computer but assume that this would mess up direct monitoring for mics and guitars? I also want to use the speakers to play music I have stored on the computer from itunes. Is there a way to send the music through the keyboard to the interface to my speakers to hear it or do I just have to run the audio through the line out of the computer? Any help greatly appreciated. Thanks in advance!