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In the requestMIDIAccess method definition, it should be made clear that they user can pick and choose - on an individual basis - which inputs and which outputs are made available to the API. That is to say, if the user has X, Y and Z devices attached, she may only grant access to X and Z, but not Y.
https://github.com/WebAudio/web-midi-api/commit/d9887def0b23e1c90014d10a297c920b84648a2b
Batch-closing RESOLVED MIDI issues. Reminder: midi issues now tracked at https://github.com/WebAudio/web-midi-api/issues