I've reinstalled the beatbox in the 1X2 rack.  This improved version has the X and Y arm channels stuffed, but just one of the DFD channels (fine) each.

I hooked up the beat PD signals for X and Y to the RF inputs, and used the following two delay lines:

• X: 140' light-colored cable on spool
• Y: 30m black cable

The following channel --> c1ioo ADC --> c1gcv model connections were made:

• X I  --> SR560 whitening --> ADC 22 -->  X fine I
• X Q --> SR560 whitening --> ADC 23 --> X fine Q
• Y I --> SR560 whitening --> ADC 24 --> Y fine I
• Y Q --> SR560 whitening --> ADC 25 --> Y fine Q

The connections to the course inputs on the ALS block were grounded.  I then recompiled, reinstalled, and restarted c1gcv.  Functioning fine so far.