MidiX is a MIDI Karaoke player that can play standard MIDI format files
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GTK+ GM (General MIDI) Monitor for GM GM2 XG and GS events and instruments.
MIDI Editor is the most powerfull MIDI manager ever made!
ScoreExtractor is an interactive multitracks wave to midi converter.
Karakan is a free and easy to use editor for creating MIDI karaoke files.
This is a worthwhile toolbox item for any electronic musician.