MIDI Thru forwards all incoming MIDI events directly to the specified output device, thereby re-channelizing them to the configured output channel. The following example illustrates a possible MIDI Thru workflow:
Example
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Select an external keyboard as MIDI input port, e.g. on channel 1.
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Select a CoreMIDI compatible background app as output port, e.g. on channel 2.
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Activate MIDI Thru.
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In the background app, set Cubasis as input port and configure a specific sound for channel 2.
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For your current track, set No Instrument in the MediaBay.
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Result: The external keyboard that sends on channel 1 will only trigger the background app on channel 2.
iOS only: Using MIDI Thru in combination with Virtual MIDI may lead to feedback loops, as Virtual MIDI blindly connects to all background apps that support this feature. In this event, use the MIDI panic button.