in short the grounds were wired differently on each frame.  The solution was to wire them identically.

Here is what they looked like before (problem state).  I made them both look like the right side photo.

https://groups.yahoo.com/neo/groups/Doepfer_a100/photos/albums/1830938856/lightbox/448632445 orderBy=ordinal&sortOrder=asc&photoFilter=ALL#zax/448632445