Hi David

> At it's simplest it's 1 input feeding 4 outputs with level controls.
> Anyone have a simple schematic or suggestions

Basically you are looking for something like a simple mixerchannel with
4 aux sends. Right

Do you want it for audio or for CV Should it have the possibility of
send inverted or not


In principle you do not need anything else than a frontplate, four
47k-pots (log for audio/lin for CV) plus knobs four 100k-resistors and
five sockets.
Connect the input socket to the "upper end" solder pin of all pots.
Connect the "lower end" solder pin of all pots with ground.
Connect the center pin of each pot via a 100k-resistor to one output socket.

So far so easy.

The trouble starts, when you want to mix several of such distributed
signals in one source (like the Aux-Send-Master in a audiomixer). This
requires a buffer amp. To avoid this you have to add a buffer-amp to the
each output.
Example: http://www.doepfer.de/DIY/amp_noninv.gif

Check out http://www.doepfer.de/DIY/a100_diy.htm and look for the matrix
mixer. Your distribution-module like a matrix mixer, but there is only
one row of the input section as seen in the
http://www.doepfer.de/DIY/matrix_mixer.gif