Hi all,  Hendrik Strengers was right -- I was looking for information
on a Hupfeld Unioliszt.  However, I didn't find such an instrument in
the Netherlands (I wish I had).  The Unioliszt mentioned is owned by
somebody in Budapest, Hungary, who has contact with a very good friend
of mine in Australia.  So far it's the only Unioliszt known (to me).
Perhaps it's named 'Unioliszt' because it's unique, but probably not...

So, what is special about this instrument?  Hupfeld is known to have
made the Phonoliszt, the electric expression piano which is also used
as a basis for the Hupfeld Phonoliszt-Violina.

The Phonoliszt only exists in an electric expression piano form,
without foot pedals.  Another instrument is Hupfeld's Phonola which
plays the Hupfeld 73-note Phonola rolls (and from 1909 also 88-note
rolls).  The Phonoliszt rolls are similar to the Phonola (73) rolls
except they have expression coding on some tracks for playing on the
expression piano.  The Phonola scale doesn't use these tracks -- they
are blanks (except two which are used for the Solodant accent function
on some instruments).

The Phonoliszt rolls can also be foot-pedalled on regular foot-pedalled
Phonola pianos.  Also, Phonola rolls can be played on a Phonoliszt
piano, but then of course lacking the expression as it's a standard
roll.  It's like playing an 88-note roll on an Ampico or Duo-Art.

Back to the Unioliszt, this instrument is both the Phonola and
Phonoliszt in one instrument.  It's an electric Phonoliszt which
also has foot pedals, sort of like an pedal electric Duo-Art, or maybe
better, a Hupfeld Triphonola.  Except, none such instrument is marketed
in any sales literature that I've seen, and I've seen quite some
Hupfeld stuff.

The Unioliszt can play Phonoliszt rolls completely automatic like
any Phonoliszt can, or you can choose to play those rolls with the
foot-pedals, giving your own interpretation of the dynamics; next to
that you can foot-pedal your regular 73-note Phonola rolls too (or play
those automatically without expression, but who'd want that).

To me it's completely clear what the instrument is, but I'm in the dark
about why it's there [in Budapest] and not known.  (I'm also looking for
a tubing chart or drawing of the expression system for a Phonoliszt,
I already have the tracker scale.)

Regards from the Netherlands,
Niels Berkers