+.TP
+.B getvol
+Print the left and right volume levels,
+as two decimal integers between 0 and 100,
+separated by a space.
+.TP
+.BI "setvol " left " " right
+Set the left and right volume levels to the given decimal values,
+which should be between 0 and 100;
+echo back the new values as for
+.B getvol
+above.