Add configurable incoming audio jitter buffer

README.md

@@ -154,6 +154,21 @@ barnard --audio-interval 20
 Supported values are `10`, `20`, `40`, and `60` milliseconds. Try `20` ms
 first; use `40` ms only if the connection remains unreliable.
 
+## Incoming Audio Jitter Buffer
+
+Barnard holds 40 ms of audio separately for each speaker before starting
+playback. This prevents brief delayed UDP packets from draining OpenAL's audio
+queue, which otherwise produces clicks or pops. To adjust this tradeoff between
+resilience and added incoming latency:
+
+```sh
+barnard --jitter-buffer 60
+```
+
+Supported values are `0`, `20`, `40` (default), and `60` milliseconds. Try
+`60` ms for a lossy or jittery connection. Use `0` only when minimizing latency
+is more important than avoiding playback underruns.
+
 ## Audio Devices
 
 You can set the default input and output devices in the config file as well.