I have an Ampico A in a Fischer baby grand that plays too softly.  All
parts have been rebuilt on this unit, but I'm having trouble regulating
the "regulating valves" to play loud enough.

It is winter here, but the relative humidity is running 35% so I'm
hoping that's enough.  The "loud buttons" help a little so I'm not sure
what that means.

I've been rebuilding for many years, but I'm not an expert on Ampico.
Any ideas are appreciated.

Wayne Lincoln