FL+FR+FC+LFE+FLC+FRC+SL+SR
@item octagonal
FL+FR+FC+BL+BR+BC+SL+SR
+@item hexadecagonal
+FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR
@item downmix
DL+DR
@end table
@item round(expr)
Round the value of expression @var{expr} to the nearest integer. For example, "round(1.5)" is "2.0".
+@item sgn(x)
+Compute sign of @var{x}.
+
@item sin(x)
Compute sine of @var{x}.