Jo, tu chybu jsem našel - Service Control Manager.

edit:
Ten Service Control Manager shazuje víc věcí než jen ten zvuk. Tady je výpis jedné té chyby:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/ev ent">
- <System>
<Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" />
<EventID Qualifiers="49152">7034</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8080000000000000</Keywords>
<TimeCreated SystemTime="2014-04-24T15:01:14.991553100Z" />
<EventRecordID>48151</EventRecordID>
<Correlation />
<Execution ProcessID="816" ThreadID="6720" />
<Channel>System</Channel>
<Computer>Denis-PC</Computer>
<Security />
</System>
- <EventData>
<Data Name="param1">Zvuk systému Windows</Data>
<Data Name="param2">20</Data>
</EventData>
</Event>