When opening issues, search for it to see if it doesn't already exist.
Contact whitebird if you wish to join the organisation to contribute code. This is also possible without joining, but mention that to him. You can contact him on Gitter : https://gitter.im/Wintergatan/Midi-to-laser-cutter Before adding a feature, check the To-Do list at the project overview: https://github.com/Wintergatan/Midi-to-laser-cutter/projects/2
Specific information about the experimental version
There are currently two versions: main and experimental. THe experimental version has the most features at the moment and is most actively being developed. Before adding a feature, mention it in the Gitter lobby.