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Can you explain how MIDI connects to an organ and what I should know to make it work?
MIDI is an old standby from the ‘70s. It is still around because it was the only thing standardized early on. Despite its shortcomings by today's standards, MIDI remains the language mainstay of musical instruments. MIDI is simply a data line that carries keying data to and from various MIDI compatible instruments. MIDI does NOT produce, contain or otherwise generate sounds. It is ONLY keying data. Sound modules, which typically store sounds digitally, depend on MIDI data to key them. Therefore, if a keyboard does not contain a sound module, it will not in itself be able to produce sound. It will only be able to send and receive keying data. Therefore, if you have a MIDI keyboard without a sound module, you will need to connect a cable from the keyboard's MIDI "out" port to a sound module's "in" port. The MIDI keyed sounds then need to be sent to an amplifier and speaker to hear them (usually via RCA or 1/4" jacks). Some keyboards are equipped with MIDI keying, sound module, amplifier and speakers. So, whatever may be missing you will need to provide the balance of the components to make the keyboard work.
The other factor that needs to be understood is that MIDI sends and receives via 16 discreet channels. This means if your keyboard is set to send MIDI data out on channel 1 but the receiving MIDI device is set to receive on channel 4, the receiving device will not "see" the data coming from the keyboard and therefore will not function. So make certain you have your channelization synchronized. If you will be sending or receiving data to and from two units on channel 2 make certain they are both set to send/receive on channel 2.
Organs typically send and receive on at least 4 channels. Great keyboard may send on channel 1, Swell keyboard will on channel 2, Pedal on channel 3 and stop data on channel 4. For every keyboard added, an additional MIDI channel is assigned. The key is to know which keyboard is sending on what channel and that the receiving unit is set to accept the data on all the channels appropriately.