Modular Synth Panels

I think I am feeling a bit dumb today. Or I am excited to get this up.
I am wrestling with this threeler and have some basic questions.  The first thing is that I 
realise that I have no understanding of how to  spec out or buy a rotary switch. If anyone 
knows of a simple way of expressing what to get I would be pleased. I see a 2 pole 4 position 
switch but nearly every 4 position switch I see is 3 poles. I don't get it and I am stuck for a 
switch.  

I also can't see 2 of the the wiring points for the switch unless it is A0, A1, V-, V+.

Is there a BOM for this puppy ?

Also is it cool to sub a 150pf for the 180 pf ?
Same question  for 47pf or 68pf forthe 56pf? 

best

g