Hello Michael

> But I thought I would ask if anybody has any recommendations for pitch
> shifting for A-100 modular systems

The forthcoming A 187-1 shall have a pitch shifter
http://www.doepfer.de/a1871.htm

> Or if there has been any information about the Doepfer (discontinued)
> A-126's possible replacement for linking with the A-143-9 (<50hz
> capability / cosine etc.)

I don't know whether this shall be a question different from the one
above. In case not: The A126 is a frequency shifter - not a pitch shifter!