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The factory default settings for the Programmable Input Selector are for it to toggle between sending all MIDI messages from InA and all MIDI messages from InB. The Programmable Input Selector is programmed by sending it MIDI System Exclusive messages (read the Programming FAQs for more details). For a complete description of the programming options, see the Programmable Input Selector Operating Instructions (.pdf file). Once programmed, settings are retained even after power is removed. The Programmable Input Selector can be reprogrammed with new settings as often as needed.
The Programmable Input Selector is MIDI-powered, and requires no batteries or power supply to operate with most MIDI products (for more information read the Power FAQs).