[Ponte Alto] music question

[elizschr at aol.com]

Greetings,

Pontoons have any amazing pool of knowledge so one of you may be able 
to point me to some resources.

My church music director just had a key made for a disused cabinet and 
discovered we have a portative organ.  It's obviously either modern or 
been updated since it's electrified and there are no manual bellows to 
pump.  It plays surprisingly well and just the top three notes have to 
be retuned.

I didn't count the keys but it seems like it was about two and a half 
octaves, maybe three.

Do any of you know where to find sheet music designed for the 
instrument.  I found a couple of electronic copies of old manuscripts 
(a 14th-ish psalter and one labeled squardipini manuscript) but I can't 
read that notation.  Any suggestions are appreciated!

Regards,
Beth/Lisbet