I don't know if this helps: Code: gst-launch-0.10 audiotestsrc freq=440 ! audioconvert ! pulsesink (needs gstreamer0.10-tools) You can change the frequency parameter from 0 to 20000. (Don't forget, you won't hear any sound while the silent profile is active)
gst-launch-0.10 audiotestsrc freq=440 ! audioconvert ! pulsesink