Hello, I want to play piano notes or 7-8 musical notes on the dashboard. I don't want to save the notes in .mp3 format. Because it's not realistic. I tried MIDI applications but I didn't know how to make sound from the dashboard.
You will need to share more information. Do you want to use a synth to actually produce the sounds for example? Or just use your client browser?
Also, what part does node-red play? If you use the browser for the sound, you can do it all in the front-end and wouldn't need node-red at all.
If you want to connect a synth, you will need to either use node-red or the browser to output the midi data to the synth, the choice of which is down to where the synth is connected physically.
Here is a piano that doesnt rely on MIDI but instead generates its own audio blobs - doesnt sound realistic like MIDI would but here you go...
All credits to https://github.com/mrcoles/javascript-piano - I just copy + pasted 
dash-piano.json (36.2 KB)
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Thank you very much it works. However, I have a small problem. When I send certain commands, I want the 1st button to be pressed. How can I do?
ex.
No idea. You will need to work that out or go with another library.
Can I assume you didnt actually want a virtual "piano on the dashboard" but just to be able to make piano sounds on the dashboard?
Yes, I want to receive a signal over MQTT and extract notes according to that signal.
In which case, a set of small mp3 or wav samples stored on the node-red server would be more suited.
MQTT --> switch node (determine note) --> file node (load file) --> play audio node.
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Midi only sounds anywhere near realistic if you are using a decent synth and probably a decent processor on top. After all MIDI is only control data, it has no sounds of its own.
