How to setup a MIDI device for a software instrument?

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BreezyWest 2018-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/428228-how-to-setup-a-midi-device-for-a-software-instrument

回答： Charlie DeVane 2019-10-9

How would I go about interfacing my digital piano with Matlab, such that I can play audio files from my computer in real-time?

Many implementations available only use a computer keyboard for input and thus don't have the velocity or sustain (via pedal) associated with the use of software instruments. I have access to the Audio System Toolbox, but am struggling through the documentation to see how such can be implemented. Additionally, what concerns are there about latency with Matlab's MIDI interface?

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Frederic Piat 2019-6-9

This is what I believe with the little experience I have but you'd need to check on my answer:

when playing files, I do not need Matlab and did not try from within Matlab, but when I play a midi file from windows, the standard windows (or any other) player plays it and if I plug my keyboard on the USB port (cord bought from Amazon for 5€, works great) the sound is redirected to my keyboard without anything else to do. I believe that will be the same if playing the midifile (but probably not just any sound file) with a Matlab command (unless Matlab translates it into a soundwave or something, different from the midi standard)
to do MIDI in real-time (I know that's not what you're asking but you may still find some answers to related questions):

https://fr.mathworks.com/help/audio/musical-instrument-digital-interface-midi.html?s_tid=CRUX_lftnav

Musical Instrument Digital Interface (MIDI)

Create, send, and receive MIDI messages

Audio Toolbox™ enables you to create, send, and receive MIDI messages. You can interface with MIDI Control Surfaces and MIDI Devices in real time.