Hi all. I keep meaning to post to this list about the under-exploited feature that all unit generators have, in that you can cause their inputs to multiply rather than add. As an example, here's a simple power envelope follower that doesn't require sample-level chuck intervention. A gain UG is used to square the incoming A/D signal (try it on your built-in mic), then a OnePole UG is used as a "leaky integrator" to keep a running estimate of the signal power. The main loop wakes up each 100 ms and checks the power, and prints out a message if it's over a certain level. You might need to change the threshold, but you get the idea. // SIMPLE ENVELOPE FOLLOWER, by P. Cook adc => gain g => OnePole p => blackhole; adc => g; 3 => g.op; 0.9999 => p.pole; while (1) { 0.1 :: second => now; // <<< p.last() >>>; if (p.last() > 0.2) <<< "BANG!!" >>>; }