Doepfer

Hello all. Here's the scenario:

I have two A100P's. Case #1 has a sequencer array [155(2), 154 & 156],
the 190 MIDI-CV, and 140 adsr (2). Case #2 has among other things, 3
vco's. I have already experienced the tuning problems that suggest I
need the 185 buss access. I am bringing in midi clock from the 190 to drive the 154/155's. 
The question is: do I need one for each case
or just one in case #2?

Thanks in advance,

Adam