This should be fixed. Please try with tomorrows Windows_Nightly_Build https://binary-factory.kde.org/job/Kden ... /artifact/

Ok, thank you for your notification! It seems to sound better now, although the values from the slider and the box still don't match. I've also made some volume changes in the mixer, maybe that's because it sounds better now.
In the program version from the link you sent me, the render process crashes at the end producing a corrupt file. I've used the Nightly Build for Linux (https://binary-factory.kde.org/job/Kden ... /artifact/). Have the changes also been applied to this version?
Are you the developer who fixed the bug? If yes, thank you very much!