Dear Howard & All,  With regard to the 46/48-key scale, this is
from Gavioli and is also almost the same as the Limonaire scale where
they loose the lowest F accompaniment and use it as the Bass note F
(Gavioli has an octave lower F bass).  The 46 has no registers, the
48 has a simple 'Piano' & 'Forte' system for soft and loud play.

Music is available from probably every music producer with thousands
of titles, so it's a good idea to use this scale!  I myself have
a large repertoire of either my own arrangements, some old originals
and some from Tom Meijers from Holland that I produce for keyed or
keyless.

Regards,
Nick Dean, England
N. J. Dean & Co.
www.njdean.co.uk