MIDI
From OHRRPGCE-Wiki
MIDI or MID is a synthetic music format supported by the OHRRPGCE. Unlike digital formats such as MP3, MIDI music is stored like sheet music and played back with a predefined set of instruments.
Older versions of the OHRRPGCE only supported BAM format, but now MIDI is supported natively, so it is no longer neccesary to convert your music into BAM.