On Thursday, July 2, 2015, acgenerator@... 1 < Doepfer_a100@yahoogroups.com > wrote:

 

I finally got it fixed.

Here was the issue:  apparently even though both both sets of boards were hooked up correctly to grounds used independently.  They mismatched on the order of using the 4 ground connections.

One had Top-unsed-Chassis-Bottom; the other unused-Top-Chassis-Bottom across the ground posts.

thanks for those that helped getting me on the right track!