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Are there good usable sound sensors on the market?

Yes there are just google on microphone...

But serious i guess you mean some thing like this ?
http://www.zonetrigger.com/sound-detection/

I wonder if homeseer can recognise my voice why could it not.... !

Sound and HS will work..
I'm looking for a simple solution to trigger a SAIX or something else.
You can buy cheap motion sensors some of them have also noise detection.