In a message dated 96-09-08 23:34:20 EDT, you write:

> It has always played softly but last year it almost stopped playing
> altogether. I had the stack/valves redone and it all plays but still
> softly

I believe that it is due more to the physical design of the pneumatics,
which tend to be "boxy", that is, when compared to a Seeburg pneumatic,
they have less leverage.  As described in Craig Brougher's book, there
are several factors that determine the operating strength of vacuum
pneumatics, assuming that the entire system is properly rebuilt.   I do
know that when your Pianino stack left my shop (In 1978),  it was as
airtight as it could have been - all wood was sealed, new leather
gaskets, valve facings, etc..

You might consider a stronger spring tension for the reserve.

Best to you and your collection,

SKG