Sweet MIDI Player is a program for not only auditioning all types of MIDI files, but for modifying the MIDI files themselves.
Use its mixer-like interface to easily edit the control messages, transpose the music, change the tempo, mute desired MIDI channels, and save the end results to disk.
Display the lyrics available in MIDI Karaoke files.
Change the arrangement with easy to use Cut, Copy and Paste commands.
Convert and save MIDI files into audio files (AIFF, AAC/M4A and other formats).
It also includes a Jukebox function which allows you to create playlists with up to 500 songs.