Il 21/06/20 04:30, Claude Frantz ha scritto: > On 6/20/20 11:10 PM, Marco Calistri wrote: > > Hi Marco and all, > >> I have finally found the root cause of the audio feedback described >> above. I've not mentioned into the anomaly description that I'm using >> Linux as O.S. and that the sound system is managed by pulseaudio, a >> Linux sound framework which in turns can be regulated by alsamixer. > > Many thanks for reporting about this strange effect. > > I think that it's important to understand the strange relationship > between alsa and pulseaudio. At the side of the interface to the sound > card, pulseaudio is using alsa modules. But when a client want to > connect to the audio system in the ALSA style, it has to use a > compatibility interface of pulseaudio. Nevertheless, the recommanded way > to connect is the native pulseaudio interface. > > Best wishes, > Claude (DJ0OT)
Hi Claude, Yes, definitely pulseaudio is the sound framework used in my Linux Tumbleweed system, the fact is that only thanks to the alsamixer I could discover every settings available into my soundcard, including the infamous "loopback" button which was responsible to cause the audio feedback from computer internal microphone into the tx audio sent in FT8 by WSJT-X. Regards, -- 73 de Marco, PY1ZRJ (former IK5BCU) _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
