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(10 replies, posted in General)

Maybe stopping PulseAudio is excessive too.
You may use this command to suspend it instead:

pasuspender opensonic_launcher

I have tried it with Audacity, but it will probably work with OpenSonic. The utility (pasuspender) is located (at least in openSUSE) in pasuspender-utils package. It mutes sound in all applications working with PulseAudio until the game process is exited.