

You can add more songs in chiptune format by changing the file name to a single number (no extension) and editing the ini file to reflect the change.
So for example, if you want to add one to the default eight songs, find your music ("song.it" for example), rename it to "8", and change the line 
numberofsongs=7
to
numberofsongs=8
in music.ini.

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[Note: for some reason ModFX doesn't seem to have any way
to retreive title data, unlike DMC2 which is great for
jukebox setups. As a result, songs have to listed by a 
track number in-game rather than title, which sucks.]

[All included musics are by Nastyman. ampersand ell tee semicolon 3 Nastyman.]