Need to be able to listen to a subset of available MIDI sources

[krevis]

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Sometimes people have MIDI devices which send sysex at the wrong time, interfering with the sysex they really want to receive. Should add a way to choose which ports to listen to.

[krevis]

This also came up with a specific MIDI interface (Retrokits RK-006) which has two midi input ports (IN_1 and IN_2) and an auto-merged input port (IN_ALL).

Workaround: use MIDI Monitor and

1. choose only the input you want
2. receive a sysex message
3. Double click it to see the details (opens a separate window)
4. Press the “Save As…” button and save it as “whatever.syx”
5. Then add the file to SysEx Librarian or do whatever you like with it

But if you want to record multiple sysex messages into one file, it's pretty awkward.