Connecting Your Instruments For Midi Quest to be able to communicate with your instrument, the MIDI IN and MIDI OUT ports of both your instrument and iPad must be connected as follows: The iPad's MIDI IN port must be connected to the instrument's MIDI OUT port while the iPad's MIDI OUT port must be connected to the instrument's MIDI IN port: This is called a two-way, duplex or handshaking MIDI connection. Duplex connections mean that each instrument requires an entire MIDI interface port: While this was once an issue, multi-port USB Midi Interfaces have become very affordable and can be had for a few hundred dollars from such great manufacturers as M-Audio (www.m-audio.com), Roland, and MOTU.
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