On bitmapped terminals, specifies
the number of milliseconds the bell rings for.
On character terminals,
specifies 100 times the number of times the terminal bell rings.
(For example, -duration 500 will ring the
bell for half a second on a bitmapped terminal, or ring the bell five
times in succession on a character terminal.)
-pitchn
Set the frequency of the bell in Herz. (This defaults to the
server default pitch. It is ignored when in character mode.)
-volumen
Sets the maximum volume n to ring
the bell at (as for XBell(); the range is -100 to +100).
The default is 50. (This option is ignored when in character mode.)