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    GObject
    ╰── GInitiallyUnowned
        ╰── GESTimelineElement
            ╰── GESTrackElement
                ╰── GESSource
                    ╰── GESAudioSource
                        ├── GESAudioTestSource
                        ╰── GESAudioUriSource
You can use the following children properties through the ges_track_element_set_child_property and alike set of methods:
| double | volume | volume factor, 1.0=100%. | 
| gboolean | mute | mute channel. |