suspend processes for sessions, which are disconnected from a window station

See more:

Vista

Windows

Hello,

 please tell me,

how to administer
to suspend processes for sessions
disconnected from a window station.

I checked, that this event would be useful:

Log Name: Security
Source: Microsoft-Windows-Security-Auditing
EventID:4779

for suspend/resume of processes:

pssuspend.exe (pstools, sysinternals)

I'm running Windows Vista Ultimate
and my target is,
to suspend all tasks
for a session, which is disconnected from window station,
and vice versa resume this tasks when a sessions is reconnected.
(fast user switching)

And why:
Because the audio from the disconnected user continues
and bothers the connected user at work.

Thank you for tips
:) Erhy :)