With regard to my suggestion concerning the addition of a Recordo
expression unit to foot-pumped players (Digest 97.01.23), I should have
given the sources that I consulted which led to the construction of my
"vertical expression regulator".

The basic information came from the Billings Rollography, Volume II.
In that volume there is a section which describes several units (A, B and
C types), suggestions concerning the setting of the various intensity
levels and some discussion about the pros and cons of the various
systems.

The other source was Craig Brougher's Orchestrion book, Chapter 8,
Designing Expression Regulators, where you will find everything you
always wanted to know about the Hickman regulator (Ampico B). . .
Let's give credit where it's due.

In the Digest of 97.01.24, Don Teach mentioned the Billings Rollography.
Volumes 1 - 5 are available for $39.00 each plus postage from:

    ROCK SOUP
    GInny and Bob Billings
    14010 Rim Rock Drive
    Reno, NV  89511-7347
    Phone: (702) 853-4659

And yes, Don -- Ginny and Bob Billings certainly are the premier Recordo
enthusiasts.  Where would we Recordo buffs be without them.

Ron Rainville