+.B sox_generation \fB0\fR|\fB1
+Determines whether calls to \fBsox\fR(1) should use \fB-b\fR, \fB-x\fR, etc (if
+the generation is 0) or \fB-\fIbits\fR, \fB-L\fR etc (if it is 1). The default
+is 0.
+.TP
+.B speaker_command \fICOMMAND
+Causes the speaker subprocess to pipe audio data into shell command
+\fICOMMAND\fR, rather than writing to a local sound card. The sample format is
+determine by
+.B sample_format
+above.
+.IP
+Note that if the sample format is wrong then
+.BR sox (1)
+is invoked to translate it. If
+.B sox
+is not installed then this will not work.
+.TP