Doepfer

"My modular has two A155 modules ... I have not tried chaining the two 
of them together to make longer sequences. If fact I'm not sure how 
you would do it, any suggestions?"

I don't have two A155's to try this with, but since the A150 switch is 
bi-directional, it could alternately route the clock signal to first 
one, and then the second, A155 in turn, no? This would allow the LEDs 
to sweep across the two sequencers (although each sequencer would 
pause on the 8th step while the other sequencer ran).

You would still need to switch between the two sets of CV signals, but 
I think the Trigger signals could just be combined in an A180 
Multiples, since they won't overlap.

Joe