This is really strange - but perhaps it's just a setting somewhere.
I'm using Blender 2.78c
I've created a scene with video+sound (let's call it sourcescene)
I'm using this scene as a scene-strip in another scene (let's call it targetscene).
Now when I start playback - an extra instance of the sound from sourcescene is started.
If I start playback from targetscene - the audio is played from whereever the playhead is in target AND from the beginning of source. If I stop playback, the part that played from the playhead-position stops (as expected) - but the extra part played from the beginning of source continues - and there is no way (that I can find) to stop it.
If I start playback from the sourcescene, the audio is doubled. When I stop playback, the double continues playing w. no apparent way of ending it until I restart playback in the sourcescene. When I restart playback the current "ghost"-audio stops, but the playback get's a new and playing "ghost"-audio
Play from target-scene:
Audio from sourcescene is played from frame 0 together with audio from target-scene - no apparent way to stop it
Play from source-scene:
Audio is doubled. No way to stop the doubling. When stopping playback - the double contintues. When restarting playback, the double stops, but another starts (from the same spot as the playback was started) and the audio is again doubled.
What is up here - is this a bug, or did I miss some setting somewhere?