add support for generating MIDI files

[monperrus]

Thanks a lot for this really cool project, the demo web app works out of the box!

It would be great to be able to generate MIDI files for a given message.

[nicolas-f]

Thanks for your interest in this library.

I'm working on the next major version of QRTone for passive buzzer compatibility.

Thanks for your feedback, I will take in consideration the midi communication protocol.

[monperrus]

Cool! Out of curiosity, what's the "passive buzzer compatibility"?

[nicolas-f]

In arduino and other microcontroller projects you can easily plug in a passive buzzer (https://wiki.seeedstudio.com/Grove-Passive-Buzzer/) It is low cost and easy to use. However you can generate only single tone square wave signal.

The idea is to create the next version of QRTone that will use only one tone and will aim at less computationally intensive processing.

[monperrus]

Nice, looking forward to it! --Martin