Our Unika (circa 1920) doesn't have a bass coupler, but I would be
interested to receive technical details of how one of this period
worked.  From what I can see, it would be impracticable for us to do
a modification, nevertheless, I would like to know the details.
Thanks.

John Lay

 [ Art Reblitz wrote, "The Unika, a keyboard-style piano, features a
 [ piano, mandolin attachment and 28 violin-toned pipes."  The music
 [ roll has 14 control channels and 52 channels for playing notes.  The
 [ octave coupler adds 10 more playing notes in the bass, controlled by
 [ hole 66 (Bass octave coupler on) and hole 3 (mandolin off, bass
 [ octave coupler off).
 [
 [ Other holes include hole 54 (Bass stack vacuum high, bass hammer rail
 [ down) and hole 58 (Bass stack vacuum low, treble hammer rail up).
 [ Ref. Reblitz and Bowers: "Treasures of Mechanical Music", (C) 1981
 [ Vestal Press, Ltd.
 [
 [ See the Weber Unika at https://www.youtube.com/watch?v=xgoR-XH68Eg 
 [ "The bass coupler was added newly to this instrument."  -- Robbie