Hello All,  I'm looking for the Hupfeld Helios and Hupfeld
Clavitist-Universal tracker bar scales.  Also searching for
any other scales based on Hupfeld 77-hole tracker bar.

I already have the Phonoliszt and Violina scales (and the
73-note piano scale, of course).  Any help appreciated.

Thank you,
Niels Berkers
Netherlands