Reaper compatibility Issue

• Dec 15, 2022 - 02:01
Reported version
S2 - Critical

Open Reaper either before or after Musescore 4 . Program closes. Can not have Reaper and Musescore open at the same time. That's a deal breaker.


I was not able to reproduce this issue. I was able to run Reaper v6.51 and Musescore 4 at the same time on Windows 10 with no issues, and even have them play back at the same time.
What OS are you using, what version of Reaper do you have, and what are your audio device settings in Reaper?

In reply to by Trainzack

Reaper ver. 6.71, Windows 11Pro.
Musescore i/o Audio device System Default, Midi out No device, Midi input No Device
Reaper Audio System ASIO, Driver: ASIO4ALL v.2

Musescore does not open if Reaper is first opened.
If Musescore 4.0 is open, when Reaper opens Musescore closes.
Musescore does works perfectly with Reaper open. No issues with the older version.

In reply to by yardbirddc

Application Crashing Events

Faulting application name: MuseScore4.exe, version:, time stamp: 0x00000000
Faulting module name: KERNELBASE.dll, version: 10.0.22621.963, time stamp: 0x766ca8ae
Exception code: 0xe06d7363
Fault offset: 0x00000000000906bc
Faulting process id: 0x0x4B44
Faulting application start time: 0x0x1D912F592BC762C
Faulting application path: C:\Program Files\MuseScore 4\bin\MuseScore4.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 89376ed6-bb6d-43a9-bba2-222e5dffd289
Faulting package full name:
Faulting package-relative application ID:

Frequency Once Many

Same issue here, except I am on Windows 10. Also, this was not a problem when I first upgraded to 4.0. It started today as soon as I upgraded to 4.01. This is a deal-breaker for me also. I really hope you can fix it because I love MuseScore otherwise.

In reply to by Jojo-Schmitz

Count me as a "Three" then. I can't get Reaper and MuseScore to play nicely either, but it's always MuseScore that crashes, never Reaper. Windows 10, 64 Bit, Reaper 6.77, MuseScore 4.0.2. I couldn't get them to start at all for a while, then eventually I tried disabling all MIDI in MuseScore. That improved things in the sense that both lived for a while at the same time, but when playback started, then MuseScore crashed again (is this inconsistent in Windows due to the sound interface, ASIO, WASAPI or something?)

I also cannot seem to run reaper 6.80 and musescore 4.02 at the same time. Musescore consistently crashes. I have read the ASIO4ALL is NOT a multi-client driver. i think it's possible to use a 3rd party virtual mixer like Voicemeeter Banana or something to get this to work, but it's not at all intuitive and I join the frustrated at at least #4 to have had this issue.