Oh ok... what happens if you do GST_DEBUG=3 GST_DEBUG_NO_COLOR=1 gst-launch-0.10 audiotestsrc ! audioconvert ! alsasink &> gst3.log (and then try some buffer-times again and report if using the audiotestsrc changes something) -- Dapper- alsasink does not work https://launchpad.net/bugs/44943