* Ensure the TEARDOWN of a play session is not delayed by a long sleep timer.
* Ignore duplicate ANNOUNCE packets for the same play session.
* Move the creation and calling of a player thread from the SETUP handler to the RECORD handler.
+* When closing an ALSA sound device, don't wait for any audio to be output with `snd_pcm_drain`; instead, just drop all remaining frame using `snd_pcm_drop`.
+* TEARDOWN complete in less than 50 ms.
**Enhancements**
* Add optional timing annotations to debug messages -- see the new settings in the diagnostic stanza of the configuration file.