+Specify parameters used when opening an audio output device.
+.PP
+.RS
+For ALSA, the format
+.B ::::
+is used where
+.B
+is the buffer time in milliseconds (values less than 500) or size in bytes (default
+.IR 40 ms);
+.B
+is the period count (values less than 50) or size in bytes (default
+.IR 4 " periods);"
+.B
+is the sample format (possible values:
+.IR 16 ", " 24 ", " 24_3 " or " 32 );
+.B
+is whether to use mmap (possible values:
+.IR 0 " or " 1 ).
+.B
+open ALSA output device twice. (possible values:
+.IR 0 " or " 1 ).
+.RE
+.RS
+.PP
+For Linux PortAudio, the value
+.B
+is simply the target latency in milliseconds.
+.RE
+.RS
+.PP
+For MacOS,
+.B :
+.B
+is target latency in milliseconds.
+.B
+open device in Pro Mode or Play Nice (respective values:
+.IR 0 " or " 1 ).
+.RE
+.RS
+.PP
+For Windows,
+.B :
+.B
+is target latency in milliseconds.
+.B
+use exclusive mode for WASAPI (possible values:
+.IR 0 " or " 1 ).
+.RE
+.RS
+.PP
+When the output is sent to standard output, the value can be
+.IR 16 ", " 24 " or " 32 ,
+which denotes the sample size in bits. Little Endian only.
+.RE
+.TP
+.B \-b :