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MIDI sequencer / editor software "Sekaiju"

A screenshot of Sekaiju, free and open source MIDI sequencer software.

"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.

■Example music created by using "Sekaiju" MIDI sequencer (MP3 format, Composer : kuzu)

Please note:

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

Name OS FileName Release day Size
Windows 7 / 8.1 / 10 / 11, 64bit版のみ。 Sekaiju8.1.zip 2024/03/24 20.2MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju8.0.zip 2024/01/21 20.2MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.9.zip 2023/07/02 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.8.zip 2023/02/12 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.7.zip 2023/01/09 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.6.zip 2022/11/06 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.5.zip 2022/04/17 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.4.zip 2022/02/13 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.3.zip 2022/01/30 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.2.zip 2021/10/24 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.1.zip 2021/09/26 19.5MB
Windows 7 / 8.1 / 10 / 11, 64bit only Sekaiju7.0.zip 2021/08/15 19.5MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju6.1.zip 2020/12/31 19.5MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju6.0.zip 2020/11/29 19.0MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.9.zip 2020/01/05 19.0MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.8.zip 2019/11/17 19.0MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.7.zip 2019/05/19 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.6.zip 2019/01/03 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.5.zip 2018/07/23 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.4.zip 2018/06/03 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.3.zip 2018/04/15 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.2.zip 2018/02/25 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.1.zip 2017/12/03 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju5.0.zip 2017/05/28 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju4.9.zip 2016/12/04 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju4.8.zip 2016/05/08 18.1MB
Windows XP / Vista / 7 / 8.1 / 10 Sekaiju4.7.zip 2016/04/17 18.1MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.6.zip 2016/01/17 18.1MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.5.zip 2015/05/04 18.1MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.4.zip 2015/01/25 18.1MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.3.zip 2014/11/23 13.7MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.2.zip 2014/09/07 13.7MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.1.zip 2014/06/08 13.7MB
Windows XP / Vista / 7 / 8.1 Sekaiju4.0.zip 2014/05/25 13.7MB
Windows XP / Vista / 7/ 8.1 Sekaiju3.9.zip 2013/11/19 13.4MB
Windows XP / Vista / 7 / 8.1 Sekaiju3.8.zip 2013/11/10 13.4MB
Windows XP / Vista / 7 / 8.1 Sekaiju3.7.zip 2013/09/16 12.6MB
Windows 2000 / XP / Vista / 7 Sekaiju3.6.zip 2013/05/05 6.28MB
Windows 2000 / XP / Vista / 7 Sekaiju3.5.zip 2013/03/03 6.14MB
Windows 2000 / XP / Vista / 7 Sekaiju3.4.zip 2012/12/02 6.02MB
Windows 2000 / XP / Vista / 7 Sekaiju3.3.zip 2012/09/30 5.94MB
Windows 2000 / XP / Vista / 7 Sekaiju3.2.zip 2012/08/19 5.94MB
Windows 2000 / XP / Vista / 7 Sekaiju3.1.zip 2012/07/07 5.92MB
Windows 2000 / XP / Vista / 7 Sekaiju3.0.zip 2012/04/22 5.92MB
Windows 2000 / XP / Vista / 7 Sekaiju2.9.zip 2012/03/04 5.92MB
Windows 2000 / XP / Vista / 7 Sekaiju2.8.zip 2012/02/10 5.90MB
Windows 2000 / XP / Vista / 7 Sekaiju2.7.zip 2012/01/10 5.90MB
Windows 2000 / XP / Vista / 7 Sekaiju2.6.zip 2011/11/06 5.84MB
Windows 2000 / XP / Vista / 7 Sekaiju2.5.zip 2011/06/05 5.84MB
Windows 2000 / XP / Vista / 7 Sekaiju2.4.zip 2011/05/08 5.84MB
Windows 2000 / XP / Vista / 7 Sekaiju2.3.zip 2011/03/06 5.79MB
Windows 2000 / XP / Vista / 7 Sekaiju2.2.zip 2011/02/05 5.66MB
Windows 2000 / XP / Vista / 7 Sekaiju2.1.zip 2010/07/30 5.46MB
Windows 2000 / XP / Vista / 7 Sekaiju2.0.zip 2010/06/06 5.43MB
Windows 2000 / XP / Vista / 7 Sekaiju1.9.zip 2010/05/04 3.32MB
Windows 2000 / XP / Vista / 7 Sekaiju1.8.zip 2010/02/28 3.30MB
Windows 2000 / XP / Vista / 7 Sekaiju1.7.zip 2010/02/02 3.28MB
Windows 2000 / XP / Vista / 7 Sekaiju1.6.zip 2010/01/03 3.03MB
Windows 2000 / XP / Vista / 7 Sekaiju1.5.zip 2009/12/13 2.92MB
Windows 2000 / XP / Vista / 7 Sekaiju1.4.zip 2009/09/06 2.64MB
Windows 2000 / XP / Vista / 7 Sekaiju1.3.zip 2009/07/14 2.57MB
Windows 2000 / XP / Vista / 7 Sekaiju1.2.zip 2009/07/05 2.57MB
Windows 2000 / XP / Vista / 7 Sekaiju1.1.zip 2009/01/17 2.43MB
Windows 2000 / XP / Vista / 7 Sekaiju1.0.zip 2008/12/27 2.42MB

Older version than Sekaiju 1.0 has been stopped releasing because of rough-around-the-edges, sorry.


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