.PP
The default is
.BR 16/44100/2 .
+.PP
+With the
+.B network
+backend the sample format is forced to
+.B 16/44100/2b
+and with the
+.B coreaudio
+backend it is forced to
+.BR 16/44100/2 ,
+in both cases regardless of what is specified in the configuration file.
.RE
.TP
.B signal \fINAME\fR
Use the ALSA API. This is only available on Linux systems, on which it is the
default.
.TP
+.B coreaudio
+Use Apple Core Audio. This only available on OS X systems, on which it is the
+default.
+.TP
.B command
Execute a command. This is the default if
.B speaker_command
-is specified, or (currently) on non-Linux systems.
+is specified, or if no native is available.
.TP
.B network
Transmit audio over the network. This is the default if