[sdiy] Banana jack question

[Greg Amann]

I currently use 1/4" jacks on my synth.  I am thinking of using  
banana jacks on a smaller synth due primarily to the fact that I will  
not require multiples and can save some space since you can stack 'em.

If I want multiple CV inputs to, say, a VCO, in a 1/4" scheme there  
are multiple input jacks with a precision CV summer in the module.

My question is:  how do banana jack schemes sum CV or audio signals.   
It all just seems like a buncha mults to me.

Thanks in advance for your wisdom, O great and learned banana-heads,   
BFG