"kcmshell4 notify" : player settings
"Use the KDE sound system" checked?
(in case and in case you're using xine as phonon backend there's btw. a chance 
that this makes knotify4 leak memory...)

Have a look at the volume slider.

The event occuring on trash deletion is a system notification (nasty sound) 
which will likely cause a volume decrease and does not unset the volume 
(whether this 
- is broken at all
- in knotify or 
- phonon or
- phonon backend,
i don't know)

Workarounds/Solutions
1) disable all "clingg" notifications and get a silent system (the last option 
in player settings)
2) use an external process to play the sounds ("play" from SoX)

Am Tuesday 26 October 2010 schrieb Aaron Lewis:
> Hi,
> 	Just for this bug:
> 		https://bugs.kde.org/show_bug.cgi?id=253288
> 
> 	Does kde implemented it's sound system with some socket pipe ways like
> what dbus does ?
> 
> 	Like when a music was played , everything send through dbus interface ,
> and it get out from another entrance ?
> 	I got this conclusion just because recently i'm doing a small
> application , and if i close it when it's playing musics , on some
> *special* events happen , i'll hear the rest of those voice !
> ( Like clean-up your waste bin with dolphin , sth. was triggered like
> cleaning up a socket and dbus just outputted the rest of my *music* )
> 
> It's really wired ..
> 
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