[MU4 Issue] Muse Keys: Notes don't playback when previous overlapped notes haven't stopped

[Polyhedron-ZXero]

Describe the bug When using Muse Keys instruments for playback in the piano grand staff, if there are notes overlapping with previous notes which haven't stopped playing, these notes won't play. When the previous overlapping notes stopped, these notes suddenly produce the remaining sound.

To Reproduce Steps to reproduce the behavior:

1. Use the "Grand Staff" template to create a score
2. Enter notes as below
3. Make sure the playback sound is using Muse Sounds > Muse Keys > Grand Piano (or any other)
4. Start playback

Expected behavior Change the playback sound to MS Basic, it produces the expected behavior.

Platform information

• OS: Windows 10

Additional context If the chord is in the lower staff but in another voice part, Grand Keys can produce the expected playback.

In addition, when the playback starts (using Muse Keys instruments), it has a slight fade-in sound effect at the very beginning which doesn't sound very good. I'm not sure if that's also an issue.

[cbjeukendrup]

Thanks for reporting this! It's a follow-up for https://github.com/musescore/MuseScore/issues/13853#issuecomment-1353607159, which was closed but indeed it wasn't fixed yet for Muse Sounds.

[JoshuaPettus]

Glad someone else found this too! Hopefully a fix can be found soon. I've been hitting on all my piano scores.

[JoshuaPettus]

It would seem this is a duplicate of #15206

[cbjeukendrup]

@JoshuaPettus I think we should keep this one open instead, because this one describes the issue more specifically.

[JoshuaPettus]

Anyway we can up the priority on this one? It's quite a noticeable issue. Especially on keyboards which is arguably one of the more common instrument to write for.

[JoshuaPettus]

It looks like this is still an issue in the 4.1 beta, will it be fixed in time for 4.1 or will it end up being in 4.2?

[cbjeukendrup]

This had to be moved to 4.2 indeed

[ThePython10110]

Fortunately, putting the notes in different voices makes them play back correctly... but it's still annoying.

[DmitryArefiev]

Fixed in #21415

[RomanPudashkin]

For those who want to try this fix: unfortunately, you need MuseSampler 0.6, which has not been released publicly yet. But it will be released alongside MuseScore 4.3

[MarcSabatella]

I don't suppose Muse Sampler 0.6 would become available in the beta channel (especially Linux) any time soon? I'd definitely be up for helping to test this.