<< This doesn't really count, but I fooled around with the SP808 at a 
music 
shop. Lots of fun, especially with the D-beam.  Somebody did express 
concerns 
about what if there were cigarette smoke interfering with the  beam. :) >>
The SP-808 has sensitivity adjustments for it's two D-Beams for sources of 
unintentional triggering--smoke, stage lights, etc.
    hawkeye