> So how would one chain two 188-1s together

1. Connect clock out of A-188-1#1 to clock in of A-188-1#2. Use the shortest
cable you have (30 cm or less). The clock oscillator of #1 is now used to
control both devices.
2. Connect BBD out #1 to audio in of #2
3. Connect BBD out #2 to ext.Feedback in #1

I'll take a look at our prototype box. As far as I remember we have built a
prototype during our first BBD researches that had four daisy chained BBD
circuits on board (e.g. four MN3005 to obtain 16384 steps). But we cancelled
the version with multiple daisy chained BBD circuits because of the poor
audio quality. But if one wants to use it as a special effect it might make
sense.

Best wishes
Dieter Doepfer