Home > Music making > Sekaiju tutorial: User interface

Sekaiju tutorial: User interface

Sekaiju is an actively developed open source MIDI editor for Windows. If you are on Windows, the good DAWs cost money. The free DAWs may be a bit complex and overwhelming especially for beginners (LMMS and Macaw). So, the next alternative is to have a good  free MIDI editor and a way to render to audio using quality VSTs and soundfonts. Synthfont solves the latter. I’ve already successfully made a dozen audio tracks using these software combined with free soundfonts/samples and VSTs around the web. This tutorial gives an overview of Sekaiju’s user interface and should, hopefully, get you started into using it.

Looks (first impressions)

The first thing that makes me decide whether or not to use any software is how its GUI looks. Although GUI look has nothing to do with functionality, it has a lot of psychological effects. I personally think that Sekaiju’s screenshots have a clean and professional feel. Like a well integrated native Windows program, no fancy dark themes most DAWs tend to have*. Although the screenshot on their website shows you several child windows at a time, it is much simpler once you try it. Sekaiju has a MDI (multiple document interface) GUI, meaning that you don’t have to see everything at the same time.

Sekaiju 2.0 simultaneously showing Track View, Piano Roll and Event List windows. (Screenshot taken from their website)

Getting started

For those who prefer an English interface and are mystified by the initial Japanese menus, press “ALT + S + L” to change to a language you prefer. That is the shortcut key for Setup and Language. You need to restart the program for the changes to take effect.

The user interface

Without any background in MIDI editing, at first I thought that the interface was complicated. But eventually I observed that many DAWs have the same user interface paradigm as Sekaiju. One thing about Sekaiju is that it contains both advanced and basic MIDI editing functionality. It is not as simple as, for example, Aria Maestosa, but it is also not something that you would leave as you become more proficient and advanced.

There are four windows that show MIDI information differently:

  • Track list
  • Piano roll
  • Event list
  • Musical score

These are accessible through the “View” menu and through respective buttons in the toolbar.

Sekaiju's menus and buttons for the different windows

Sekaiju’s menus and respective tool bar buttons for the Track list, Piano roll, Event list and Musical score windows. Also seen is the universally recognized Play, Record, Rewind and Fast forward buttons.

Track list

When you start Sekaiju or open a MIDI file, this is the first window that will show. The track list is a sort of a summary, showing different instruments together as tracks. Here you see the measures/bars of the track , midi  device related information such as ports and a zoomed down representation of the notes.  The common things you can do here are:

  • Choose an instrument for the track (Program Number column). You either scroll through the list of 128 GM instruments, but if you already know the number (e.g. 73=Flute), it’s faster to type the number directly.
  • Turn sound ouput on a  track on or off , emulating typical “mute and solo” functionalities (OutputOn column).
  • Give a track a descriptive name (Name Column). It can be something other than the generic instrument name (e.g. “Stratocaster” instead of “Distortion Guitar”).
  • Drag/copy/paste parts of a song across measures or across channels (like mixing in DAWs)
Sekaiju's Track List window

In the track list window you can change the instuments, name tracks, and mix tracks.

Piano roll

For me, this is where most of the work is done. You access this by pressing “View -> Show new Piano roll window” or by pressing the button in the toolbar that looks like a , uhm..,piano roll (note that this will create a new window). Here, you will see the notes in piano roll representation and be able to edit them. Below the notes, you also see the automation, other MIDI parameters that can be tweaked like velocity, pan, pitch bend etc.

Piano roll zoom

The first thing you will probably do in the Piano roll is increase the zoom level (this was my first problem). This can be done by clicking the “+” or “” buttons beside the scroll buttons, or as of version 3.2, using “Ctrl +” “Ctrl –” keyboard shortcuts (similar to web browsers and word documents). To change the default zoom levels, go to “Setup -> Options… -> Piano Roll (tab)“, and change the Default zoom scale values.


Besides pitch and  time and duration, there are many more properties that can be altered in a note. These are modified through the “Automation” part which is also in the piano roll window, below the actual piano roll.  The most common being the velocity (related to loudness). Some properties, like velocity only applies to one note at a time. Other properties like the CC# numbers (control change events) can be changed at any time during the song and is not specific to a single note.  Examles of CC# parameters are pan, reverb, chorus and delay.

Sekaiju's Piano Roll window

Sakaiju’s piano roll and automation windows. Where most of the music is done.

Musical score (notation) window

For those who are comfortable with music notation, this is another way of editing MIDI. You access this by pressing “View -> Show new Musical score window” or by pressing the button in the toolbar that looks like two eight notes (♫). I would admit that it is better to use something like MuseScore if you are serious with music notation. But there are also good reasons to have it around. If you eventually want sheet music, this is a way to see whether the notes you make are readable on standard format. Despite not having a “sheet music”-like appearance, Sekaiju actually does a cleaner job than MuseScore in converting MIDI into a readable notation. However, I would still consider score notation a transition instead of a main functionality as there are a lot more things you could do in a full blown score writing program. Nonetheless, I prefer the greater freedom in a piano roll editor.

Sekaiju's Musical Score window

Not as good as MuseScore (or Finale/Sibelius), but not bad either for a MIDI editor.

Event list

Except for the three to five rows in the event list, beginners or hobby musicians, like me, will seldom need to modify the event list directly. The event list is a more for the advanced users or sound engineers who understand the MIDI internals. The Event list reflects much more detailed information abut the MIDI file, with more precision in time. But it is difficult to imagine musical structure from the event list alone. If you’re not creating MIDI files from scratch, you may ignore the Event list for the moment. I’ve used this once to alter the tempo in a more controlled way (tempo is one thing where you need exact numbers). Event list can be accessed by pressing “View -> Show new Event list window” or by pressing the button in the toolbar that looks like a spreadsheet/table.

Sekaiju's Event List

If you know the MIDI specification, advanced editing can be done in the Event list.

Use of the Event list (update to this tutorial 05 Oct 2012)

When creating a MIDI file from scratch, some global musical properties are set here (since I always start by using MuseScore, or recorded MIDI, I did not notice this until more than a dozen MIDI projects). The following can be modified in the event list:

  • Tempo (default is 120 BPM)
  • Time signature (default is 4/4)
  • Key signature (default is C Major)

The Tempo, Time Signature and Key Signature fields will be seen in the “Event kind” column within the first few rows.  You don’t have to know the microseconds per quarter note or clocks per quarter note values as Sekaiju automatically corrects these when you modify the tempo and time signature. Some MIDI files won’t have the Key signature specified.


After setting the MIDI input device, recording looks rather straight forward. You press the record button or press “Ctrl R” and you’re ready to go. You should also setup MIDI output to hear what you’re playing (the default Windows GS if you’re not too picky, you just need the MIDI data). I sometimes use BASS MIDI to replace the default Windows Roland GS Synth. You can set the position at which recording starts similar to setting the playback position.

Switching between windows

Using the “View” menu or the buttons as described above creates a new window. This can allow you to see different part of the same file, like using split or multiple windows to edit different parts of a Microsoft Word document. If you don’t want to create a new window, you either click the window where you want to work, use the standard “Control Tab” shortcut key, or use the “Window” menu.

Quirks/Tips/Not so obvious things

  • Remember to press “ALT +  S +  L” to change the language during first time use.
  • Prior to version 3.2, zooming can only be done by clicking the “+” or “-” buttons along the scrollbar. I failed to notice this at first.
    • Ctrl +” and “Ctrl  –” ,which are more common shortcut keys, can now be used.
    • The default zoom may be a bit small, but these can be changed on the settings.
  • In the Piano roll, the Line tool which is for drawing lines on the automation also works for note entry, but not for a single note.
    • The Pen tool can make an extended single note.
  • In the Piano roll, if you want notes with arbitrary positions and lengths (unquantized) select “Free” from the note length dropdown.
  • No installer. The program is portable. Since Windows 7’s interface is type and search, I never bothered putting it in the proper “Programs” folder and making a shortcut.
  • The truck looking button opens a new track window. I still don’t get the logic behind the fish looking button (Auto page update).
  • By default the playback restarts when it reaches the end of the song. This can be disabled by toggling off the loop looking  button (Auto Repeat).
    • The play button remains pressed. So if you go  back to a part of a song, and Auto Repeat is enabled, it will keep playing. You have to manually “un-press” this button.

Moving forward

With a familiarity of Sekaiju’s user interface, you may now proceed to creating a MIDI file from scratch* which would be dealt with in the next tutorials on creating a simple MIDI example.

Foot notes:

* I have nothing against dark themes used by most DAWs. I’m just puzzled to why most of them do that. It makes me feel that they are copying each other, even in the non functional features.

* This tutorial is based (biased) on how I use Sekaiju. Other users might emphasize different features.

*Not totally from scratch. The tutorials will use a sheet music for reference. I can’t teach creativity, imagination and composition :P. But the point is, we don’t start with an already existing MIDI file.

Categories: Music making Tags: , ,
  1. July 13, 2013 at 2:01 am

    Thank you. That helps me alot :D

    • July 25, 2013 at 11:48 am

      You’re welcome! I’m glad it could help. Happy music making! :)

  2. gxx
    October 1, 2013 at 9:35 am

    One issue I’m having with Sekaiju is that program & control change events don’t get inserted until the second beat by default. Presumably this is to allow hardware devices to sync up, but if you want the song to start on the very first beat (composing for games etc.) you have to edit the event list or else everything will be a piano for the first few notes. Easy enough to fix, but annoying nonetheless. Know if this can be changed?

    • October 1, 2013 at 12:35 pm

      Hi gxx, I also observe something similar when starting a midi file from scratch, the weird stuff at the start of the MIDI file. But it haven’t been a big problem with what I do (also since I often start with musescore). I would suggest you post on the forums. The developer, kuzu, is very nice and responsive to simple requests, despite being very busy. I had made a few small suggestions that immediately got incorporated in the next version.

      • gxx
        October 1, 2013 at 10:24 pm

        Thanks, I’ll try that.

  3. Bridgette
    January 1, 2014 at 5:39 pm

    I love this software. It is very much modeled after the 1990’s Cakewalk 3.0 (which still enjoys a wide MIDI-only user base because it is THAT good). Since Cakewalk 3.0 will not run on 64-bit hardware, this application is something to get excited about. Features I’m waiting to see if the author employs are multiple filters for quantizing and editing (like Cakewalk has), and a fantasy dream would be if it could interpret Cakewalk Application Language (CAL). On the other hand, what is already in this software is an improvement over the Cakewalk interface – such as zooming in the tracklist window, seeing events in the tracklist window, and application menus and integration that are more aligned with newer Windows functionality. I can’t believe something this useful is free. I have paid for worse.

  4. Bridgette
    January 1, 2014 at 5:46 pm

    Another BIG improvement over Cakewalk is the ability to activate or deactivate tracks in the various window displays. In Cakewalk, what tracks you open in an alternate view are the tracks you are stuck with until you open different tracks in an alternate view.

  5. AngelofDeath
    April 6, 2014 at 3:04 pm

    Hi, I recently downloaded v3.9 and followed the instructions for changing the language, but whenever I click Okay and restart the program like it tells me to, it always stays in Japanese. Is this a known bug or am I doing something wrong?
    I’m running Windows 7 Professional SP1 x64.

    • jugo6
      May 2, 2015 at 8:26 pm

      dont put the sekaiju folder in programs of program files, but anywhere else.

  6. jugo6
    May 2, 2015 at 8:25 pm

    Hello, does anybody know how to make sekaiju the standard program for midi? I upgraded to build 4.4 but now i cant select it to be the standard program

    • jugo6
      May 5, 2015 at 2:00 pm

      I found the answer myself, if it might be of use: The problem is that *.mid was associated with the old sekaiju.exe I first tried to rename the new sekaiju.exe, to sekaiju4 but that gives an error in the program execution. Then I found “Default programs editor” it gives an easy standalone solution to restore the “open with” association. And opportunity to add more possibilities. Great program!

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