"silence" in .debug file

[mmcknight]

What does the "silence" line that I find in winboard.debug mean?

Thanks,
Matt

[H.G.Muller]

This is printed at points where WinBoard in principle could have produced a sound, but the sound selected for the event was "no sound". It helps me debugging the sound stuff. I guess like most such messages at the moment it is not terribly useful, as all sound stuff seems to work like intended.