Help making an NS-2 Noise gate schem

[william]

I've opened up my NS-2 and taken a few snapshots of the inside with the intention of building something similar into a rack.  I've started tracing a schem of it but everytime I start, I get lost between switching elements, and unknown IC's.  I have ground, V+ and 1/2 V+ identified, but other than that, what I have done so far is inaccurate.  

Anyone wish to help me trace this schematic?

William