> LC_ALL=en gst-launch audiotestsrc ! gsmartaudiosink

(gst-launch-0.10:25516): GLib-GObject-WARNING **: value "-0.000029" of type `gdouble' is invalid or out of range for property `volume-level' of type `gdouble'
** Message: no mixer, listen to NameOwnerChanged
Setting pipeline to PAUSED ...
** Message: gsmartaudiosink0
** Message: autoaudiosink0
** Message: tempsink
** Message: audiotestsrc0

** (gst-launch-0.10:25516): WARNING **: no volume element in the pipeline
ERROR: Pipeline doesn't want to pause.
ERROR: from element /autoaudiosink0-actual-sink: Could not open resource for writing.
Additional debug info:
gstalsasink.c(635): gst_alsasink_open (): /autoaudiosink0-actual-sink:
Playback open error: No such file or directory
Setting pipeline to NULL ...
FREEING pipeline ...