Maybe I've totally missed what the problem is here, but it appears this is a common problem/misunderstanding. If that is not the case, then sorry for oversimplifying your issue. You should more closely investigate your alsamixer(1) options. Many consumer soundcards have the ability to capture from a "mix" source which allows you to mix CD player, AUX/Video sound, system PCM sounds, Microphone sounds together and record that, or route the mixer output to your soundsystem. Typically you might use this in a VoIP-chat program to feed the microphone input directly for capture and transmission, while separately having a "mix" consisting of your own voice (so you can hear yourself talk while wearing a headset) and the caller's voice for playback into your headset. If through configuration error, you end up capturing this "mix" source, or if there's "bleed through" from the headphones back to the microphone then the person on the other side will end up hearing an annoying delayed feedback of their own voice. (of course,If you're using speakers then your microphone input or VoIP software would need to have some special "feedback elimination" capability to prevent the caller's voice from from feeding back to the microphone input....) Note the "Stereo Mixer" option (from amixer(1)): Simple mixer control 'Input Source',0 Capabilities: cenum Items: 'Stereo Mixer' 'Mic' 'Front Mic' 'Line' 'CD' Item0: 'Front Mic' So be sure your capture source is set to just "microphone" and not "mixer" sources. Consider that in alsamixer(1) there is both a capture (F3-screen) and playback (F4-screen) source for the microphone input. This is the "microphone monitor" setting that would mix the microphone back into what you hear: Simple mixer control 'Mic',0 Capabilities: pvolume pswitch penum Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off] Whereas this is the capture input that must also be set for "Input Source" as "microphone" or "front mic" and not "stereo mixer": Simple mixer control 'Capture',0 Capabilities: cvolume cswitch penum Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [30.00dB] [on] Front Right: Capture 31 [100%] [30.00dB] [on] Simple mixer control 'Capture',1 Capabilities: cvolume cswitch penum Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [30.00dB] [on] Front Right: Capture 31 [100%] [30.00dB] [on] Niels http://nielsmayer.com ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
