[chuck-users] question about input detector from adc (MIC)

Dear all, I would like to detect "sound" input from MIC (adc). It means that if any sound occure, one event or anything should be done. My thought is that: adc => gain g => blackhole; 1 => g.gain; g.last() => float x; while( true ) { if ( std.fabs(x) == 1. ) <<<x>>>; } But the x is always 0. So how to do it?? Thanks a lot!! Lewis