Doepfer

Hi there --

Does anyone have experience with both of these (Doepfer 138c
polarizing mixer and Bananalogue Serge 3P), and can comment on the
pros & cons of each?  

If I'm understanding the descriptions properly, the input 1 knob on
the Doepfer acts the same as the Output knob on the 3P, as
positive/negative voltage source offset.  So there are three extra
inputs on both, plus voltage offset.  Is that correct?  Or on Doepfer
do you get double the manual offset, with input 1 plus output knobs? 
Are there any other differences between them?

(I know there was a discussion earlier about accuracy of the 138c;
that doesn't concern me.)

Thanks in advance,
Ernst