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Summary: MIDI global controls allows an external controller or keyboard to act like a slave while the computer sends sounds to it. control your MIDI sounds form a computer through a keyboard with the click of a mouse as an experienced music producer shows you how in this free video.
"When using the keyboard in the midi set-up, sometimes you want to use the keyboard keys, but you also want it to be like a slave to your computer. You want your computer to be able to send data into it, and play whatever the computer wants it to play. As far as if you're recording midi tracks, you want that, you want those tracks to play through the keyboard. So, what usually happens, you need to control, you need to turn off your global control. The global control is basically allowing you to turn off the control with the keyboard from the keyboard. The keyboard will send midi data to the program that you're using, and then bring it back into keyboard, and play it right back into the program, through an auxiliary track. What happens is, sometimes if you play the data, if you play the keyboard, it's going to, it's going to like, whoop. It's going to play it two times, and it's not really going to be working the right way. You've been hearing the audio from the keyboard, while you have another computer telling the keyboard to play these notes as well. So, what you want to do is really try to turn off the global control, so that what happens is, don't, when you're playing the keyboard, it's only playing the computer. It's not playing the actual keyboard. It's playing the key, the keyboard is playing the midi data on the keyboard, which is sending it to the keyboard, and sending it back. So you can get that sound."
eHow Article: Pro Tools MIDI Global Control Tips