In the past, I believed that the name of the Biphone registers on
a street organ, Biphone I and Biphone II, just referred to the fact
that there were two such registers in the organ.  By inference from
some readings, it would seem the names refer to registers of different
composition.  It would seem that Biphone I is always in melody and has
two ranks, both at 8' pitch (I would like to know the composition),
while Biphone II is always situated in the countermelody group and is
composed of a stopped pipe playing at 8' and an open pipe playing at 4'.

Is that correct?  Hopefully someone will be able to set me straight on
this.

Dave Vincent

 [ Found at http://www.dolmetsch.com/defsb2.htm  --
 [
 [   Biphone: a pipe register used in certain pipe organs and including
 [   two ranks of stopped flute pipes at 16 ft. (or occasionally at 8 ft.
 [   and 16 ft. scale) used in the melody or countermelody section and
 [   often used with a general tremolo
 [
 [  -- Robbie