There is an open source application called notifu which is a command line tool for creating notifications in the system tray. This application has a '/q' option which disables the sound when the balloon pops up (I tested this). So it must be possible somehow (for exactly how I should try to understand the source code) to disable sound on a per message basis.

In reply to Re^4: Prototype problem for XS module by chessgui
in thread Prototype problem for XS module by chessgui

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