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What would using my guitar as a midi controller enable me to do, and is Bars & Pipes involved?
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For example you could record the MIDI data of what you're playing (i.e. the notes, length, velocity and the like) to your favourite MIDI sequencer software (including Bars & Pipes). You can edit it, have another MIDI capable instrument (e.g. a synth) playback the melody and so on. The long explanation -as usual- can be found here:
http://en.wikipedia.org/wiki/Midi ;-)
