WSPR Sound Problem Ubuntu 9.04

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WSPR Sound Problem Ubuntu 9.04

Yesterday, I successfully compiled WSPR under Ubuntu 9.04. The program starts without a problem - but:
When I connect my receiver to the input of my notebook, WSPR doesn't show any signal.
I have played with the volume settings, but there is still no signal.

There might be a problem with portaudio library used by WSPR in connection with the pulseaudio server
under Ubuntu. But even a "killall pulseaudio" gives a solution.

Has anyone so far managed to get WSPR reception working under Ubuntu 9.04 or any other distribution with
pulseaudio sound system?

Thanks for your help!