Alan - yeah, this is a handy technique. You may want to use a WaveShaper as a rectifier - that's what I did for the "envelope follower" in https://webaudiodemos.appspot.com/input/index.html. (that demo makes more sense if you select "waveform" in the visualizer.) Code here: https://github.com/cwilso/Audio-Input-Effects/blob/master/js/effects.js#L739 . And yes, we really need an envelope follower node, because in practice you really want separate attack/release controls (the VU meter script processor code I wrote has a crude release, but no attack control). This is captured in https://github.com/WebAudio/web-audio-api/issues/246, and related https://github.com/WebAudio/web-audio-api/issues/13.
Received on Wednesday, 13 August 2014 15:49:22 UTC