Midi recall


Amazing lib, love the way it makes the web midi api easy to use.

I think a full recall of the connected midi device could be something really useful.

Right now I'm storing the patches/values as a json but I didn't found yet the proper method to update it in the midi connected device at once.

I tried to iterate through all the parameters using a delay between update and update (like this the midi connected device do not crash) but it sounds a bit hacky to me.

It would be great to have an optimised method to the job... or probably I'm missing something?

Any tip about this practice is welcome,



  • Hello Andrea,

    MIDI devices are widely different. As far as I know, there is no normalized way to retrieve all settings from any device. If you want to save and restore all settings, I believe you will have to send a system exclusive (sysex) message to ask your device to dump all its data. Later, you will send another such sysex message to restore the data. However, the way this is done is manufacturer-specific. So, there is no standard way for WebMidi.js to do it.

    Maybe somebody else here has another idea?

  • Thanks for the prompt response Jean-Philippe,

    Effectively this sounds as the proper way to do it. I'm going to investigate more on how to handle sysex with the stuff I want to control.

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