To complement my last post above: I discovered the recordings with the second program above, 'audio-recorder' were 'fake files' quiet without sound when playback with vlc or other programs. Loaded in Audacity showed only straight lines. Possibly there is some gstreamer related issue on my current system, because a warning complained about missing gstreamer plugin, when I tried to save audio as mp4. However, I don't care to debug this program issue for now. The audio clips recorded with 'gnome-sound-recorder' worked fine. For one or another reasen I had to unplug the usb connection from UFO202, before playback sound could be heard in speakers and earphones plugged to the mobo backpanel jacks. *Audacity* I saved a testproject with Audacity and exported some test clip with the following properies: ~/Audacity_project/export> file *.* testproject-1.flac: FLAC audio bitstream data, 16 bit, stereo, 44.1 kHz, 1058356 samples testproject-1.mp3: MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo testproject-1.ogg: Ogg data, Vorbis audio, stereo, 44100 Hz, ~160000 bps, created by: Xiph.Org libVorbis I testproject-1.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz ~/Audacity_project/export> mediainfo *.* | egrep 'name|Format|bit rate' Complete name : testproject-1.flac Format : FLAC Format/Info : Free Lossless Audio Codec Overall bit rate mode : Variable Overall bit rate : 715 kb/s Format : FLAC Format/Info : Free Lossless Audio Codec Complete name : testproject-1.mp3 Format : MPEG Audio Overall bit rate mode : Variable Overall bit rate : 227 kb/s Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Format settings : Joint stereo Minimum bit rate : 32.0 kb/s Complete name : testproject-1.ogg Format : Ogg Overall bit rate mode : Variable Overall bit rate : 158 kb/s Format : Vorbis Format settings, Floor : 1 Complete name : testproject-1.wav Format : Wave Overall bit rate mode : Constant Overall bit rate : 1 411 kb/s Format : PCM Format settings : Little / Signed ============ Terje