It sounds like the system described by Ken Marts in the 010204 MMD is a
Recordo system.   There are five holes starting at bass: #1, bass rail
lifter; #2, mandolin (if present); #3, sustain; #4, re-play; #5,
rewind.  Treble side, left to right: #1, no. 1 intensity; #2, no. 2
intensity; #3, no. 3 intensity; #4, no. 4 intensity; #5, treble rail
lift.

The intensity tubes run into the expression box left to right.  All
other tubing should be straight forward.  If necessary, I can send pics
of my own Recordo system.  It also has the Motor Player Corp. turbine
pump.

Recordo rolls and other E-type rolls are still available.  You have to
search for them though.  I also have a tubing diagram that I can copy.
It may not totally suit the Baldwin, as mine was fitted into a
Gulbransen.  The same principles though.

Paul Brennan