"how do you use the a156..."

I'm fond of random LFOs patched to the A156. I don't have an
Attenuator/Offset module (the A156 doesn't respond to negative
voltages), but the A138a mixer and A176 CV source do the job just as
well. (The A176 is a VERY helpful module to have with the A156, it's
needed frequently for transpositions as well).

Joe