Emergency backup kicks in for about 300ml each surge, no real noise associated as the pipe doesn't even come close to filling (1"). Noise you hear at the moment the level hits the emergency is actually the CSD's syphon.
Durso's and stockmans in this configurations don't work at all well - they need to be much more tuned to flow than is possible in this system. Thus the tuning of the main w/ filling the overflow area to accomodate the majority of the surge is the preferable method. (Did test your theory; tuned for minimal and maximal flow, and one of each - either way consistantly sounds like a badly tuned stockman or durso)
However, flow in the tank is friggin awesome  Dunno how well it shows on the video (did add some crud (Scientific term for the stuff at the bottom of the mixing tank) to show better) Get some awesome vortices running in the corners of the tank that peter out into the middle; that should make for some interesting random flow
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