MOTM

: I've always thought it would be nice if one
: could standardize a schematic syntax for modulars.

What's wrong with the computer flow-chart like "block diagrams" that's used
in the original Arp 2600 manual?

Audio signals enter sides of the boxes
control signals top/bottom

Just add a little more detail (knob settings) into each module "block" and
there ya go. Works for me anyway...