Scope retains last trace when audio server is paused

[emlyn]

At the end of a run, when the audio server gets paused, the scope stops updating, keeping the last trace. Usually this is (almost) a straight line, but in some cases I've seen it stop with quite a large wave still present, which looks a bit strange. Maybe it should draw one last horizontal line at 0 when the run is stopped.

[samaaron]

Yes, I've noticed this, it seems to happen if you hit Run and Stop in quick succession.

I must admit, it's not particularly high on my TODO list right now, but if someone else wants to look into this, I'd be happy then help out :-)