Some state change occurred. The current set of keywords is:
.RS
.TP
+.B completed
+The current track completed successfully.
+.TP
.B disable_play
Playing was disabled.
.TP
.B enable_random
Random play was enabled.
.TP
+.B failed
+The current track failed.
+.TP
.B pause
The current track was paused.
.TP
+.B playing
+A track started playing.
+.TP
.B resume
The current track was resumed.
+.TP
+.B scratched
+The current track was scratched.
+.PP
+To simplify client implementation, \fBstate\fR commands reflecting the current
+state are sent at the start of the log.
.RE
.TP
.B volume \fILEFT\fR \fIRIGHT\fR