3d printer music

This is a python script to convert MIDI files to g-code. It will use x,y and z separately to play different notes at the same time.
The enclosed files are known to work on Ultimaker.
Just put the printhead in the middle of the platform with the nozzle not touching the plate and launch the "print"!
_This should work for any non-delta printer given the right settings._
__The whole project is here:__
https://www.youmagine.com/designs/music-for-3d-printer
and here:
https://github.com/mpatoulachik/MIDI-to-CNC
It is based on other people's work (see the whole chain in Github), many thanks to them !!!
Feel free to contribute if you want to make it less ugly (visually and code-wise)