Quarter Tone Playback plugin crashes Musescore

• Oct 30, 2015 - 21:03
P3 - Low
S3 - Major

The demo song provided seems to work fine, but when I try to enable the sharp and flat plugins, MuseScore stops working.


Which demo song? Which version of MuseScore? Which OS? Have you installed the correct version of the plugin for the version of MuseScore you are using? Can you give precise step by step instructions to reproduce the crash?

Title Crashes Musescore Quarter Tone Playback plugin crashes Musescore
Status (old) active needs info

Still Need Information about your OS and the exact version of MuseScore. It works just fine here, MuseScore 2.0.2, Windows 7 (Enterprise, 64bit)

Not the OP of this thread, but the Slash Sharp and Slash Flat buttons both crash MuseScore 2.0.3 under Mac OS 10.11.5 when you click "OK" after checking their check-boxes in the Plug-in Manager.

I'm on 2.0.3 on Windows 10 and I think at the time I made the first post, it was on 2.0.2. It still crashes for me. I think I tried on my other computer on Windows 8 or Windows 7, but I'll have to check that again.

Attachment Size
mscrash1.png 43 KB

Same problem here with Linux Mint 17.3 Cinnamon and MuseScore 2.0.3. Enabling QuarterTone Playback in the plugin manager is fine, but when I try to enable SlashFlatButton or SlashFastButton MuseScore crashes. However, the demo that comes with the plugin worked even before installing the plugin, which I don't understand at all.

Same thing here, but it doesn't crash when I load up QuarterTonePlayback, but it crashes when I load up SlashFlatButton and SlashSharpButton.
(Windows 10, 32 bit, MuseScore 2.0.3)


I downloaded the plugin, in the example score the music is played correctly -we hear the quarter ton - but the plugin itself don't work at all.

I downloaded it and installed it in the "/home/..../MuseScore2/Plugins/QuarterTonePlayback" folder. When I open the example score or any other score and try to activate the plugin then click on "ok" the software crashes.

Impossible to use (I use Mint Cinnamon 18 Sarah).

Can anyone help ?

Thank you.


I found the solution to the problem.

First unzip the package containing the plugin folder "QuarterTonePlayback" and move it here :


Second, execute Musescore, and open the plugin manager. You will find three plugins :

Select only the first one (selecting one of these latter will make Musescore crash).

The plugin works.

Et voila.

Nota Bene 1 : Sincere thanks to the programmer who wrote this plugin.
Nota Bene 2 : Seems that there is still one issue or two beside the mentioned above discussed here : https://musescore.org/en/node/53951

So I guess those 2 additional qml files are no real plugins, not in the sense MuseScore sees them.
I won'der whether they could either be prevented to load or get intergared into the real plugin.

Tamz - Unfortunately everything you suggested doing is what I did originally and for me it still doesn't work. But the plugin does work on the demo file, even if I uncheck the Plugin in the Plugin Manager. If I cut and paste the demo song into a new score but use a different key signature it still sounds exactly the same as the original demo; in other words changing the key signature doesn't affect playback! And deleting flat-slash and sharp-slash accidentals from the demo doesn't effect any changes in playback either.

So it seems that the quarter tone playback on the demo is pretty much fixed regardless of any changes I make and regardless of whether the plugin is activated or not. And cutting and pasting copies the quatertone playback automatically.

the plugin alters pitches, copy and paste copies pitches, so what are you wondering about? Once the plugin did ist Job the changed pichets are in the score, no Need anymore for the plugin, nor the accidentals

Ah, well that makes sense. But then again is it impossible to modify the playback of the score once the plugin has been activated?

But it still only works on the demo and not on any score I create; am I missing something here? If I use quarter tone accidentals from the accidentals palette they don't affect playback, and if I use the ones in the plugin Musescore crashes. Incidentally this is the only time Musescore has ever crashed on me - usually it's remarkably stable.

The plugin uses these 2 accidentals b-slash and #-slash from the accidentals palette (of the advanced workspace) to tell the plugin which notes to tune.
By how far you can set in the plugin, additionally you can set a quarter tone key sig with the plugin, but that isn't reflected in the score, not as a keysig, just as the tuning, as if there were such a keysig. So you'd need a custom keysig in addition to visualize this.

So first you use these 2 accidentals, then you run the plugin.

Once run the tunings are done, neither any keysig nor any of these 2 accidentals are needed anymore, removing them doesn't change the tuning (as that is now 'baked into' the exising notes), adding more doesn't have any effect either (as MuseScore doesn't have playback for them, by itself).

You are not supposed to use the SlashFlatButton or SlashSharpButton 'plugins', because really they are not plugins, just the QuarterTonPlayback, and these 2 quarter tone accidentals b-slash and #-slash from the accidentals palette (of the advanced workspace)

I believe the only purpose of these SlashFlatButton or SlashSharpButton qml files is to draw the corresponding buttons in the QuarterTonPlayback pluging.
And there got to be a better way of doing this, making sure these are not getting offered by the plugin manager.

OK, so now I know the theory, but I still can't get the plugin to work anyway. In the explanation in the PDF file "QuarterTonePlayback" there's a screenshot of the plugin but I can't get that window to appear even if I check the QuarterTonePlayback box in the plugin manager. I previously thought it was enough just to check the box and press OK, but evidently not. Am I overlooking something really basic, or is the plugin maybe not properly installed?

Same problem here. Installed the plugin once in the software plugin folder and once in the documents folder but the plugin doesn't work and the software crashes when you enable the slash plugins.
I use MuseScore 2.0.3 on Windows 8.1 64bit.

You are not supposed to activate or use the slash 'plugin', it does have a .qml Extension (and this is the only reason why you can activate it in Plugin Manager), but isn't really a plugin (and that is the reason why it crashes). Just activate and then use the QuarterTonePlayback plugin

Severity S2 - Critical S3 - Major
Type Functional Plugins
Frequency Once
Priority P3 - Low
Regression No
Workaround No