"Sekaiju" is free, open source MIDI sequencer / editor software for creating and editing MIDI data. You can record MIDI keyboard or synthesizer's playing to the computer, and you can compose music to play with your MIDI modules or synthesizers. Since it allows to edit all kind of event, and has unlimited undo and redo feature, Sekaiju also can be used as a powerful MIDI editor. It has a real-time input feature which can input each MIDI channel messages into spearated tracks at the same time, too.
Sekaiju is made in Japan, therefore default GUI language is Japanese. Here shows two way to change to English.
(a) Select "設定(S)" - "言語(Language)" from the menu and select "English" in the language dialog, and restart Sekaiju. If the menu gets character corruption, press [Alt]+[S] and then [Alt]+[L], and you'll open the dialog.
(b) Open "Sekaiju.ini" in your text editor, change "UserInterface=Japanese" to "UserInterface=English", and then save it, and then execute Sekaiju.exe
Older version than Sekaiju 1.0 has been stopped releasing because of rough-around-the-edges, sorry.
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