This is the home of defMON — a music editor for the Commodore 64. There is no official support for the program, but at least there is this wiki that allows defMON operators to collaborate to accumulate information and documentation. Contributions to the site are encouraged. Just register and go ahead!
If you enjoy defMON, please consider donating what you think it is worth! Click here to set up a small monthly donation. That will go a long way in supporting continued bug fixes of defMON as well as development of defMON II which is now in the making!
defMON related discussions take place in the defMON forum.
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