[Issue migrated from SourceForge | ID: 3084451 | Submitted by 'jrhb']
[http://sourceforge.net/support/tracker.php?aid=3084451]

DectectSilence fails when first sample is zero. This never ends:
{ DetectSilence.ar(DC.ar(0), doneAction: 2) }.play;
This is a problem for synths that are accidentally started with zero amplitude and never get freed.