[sdiy] MFB Synth - modification tips wanted

[steve jones]

Hi All,
I am now the proud owner of a MFB Synth:
http://www.mfberlin.de/Produkte/Musikelektronik/MFB-SYNTH/MFB-SYNTH/mfb-synth.html

and its Great! 

I'd like to be able to add a few modifications, such as CV/gate
outputs (it has a built in sequencer) VCF envelope cv out, audio in to
filter etc. I've not been able to find the schematics anywhere, so I
was wondering if anyone has any tips for investigating the circuit
board, to find insert / tap points. 

Any tips / suggestions / URLs most welcome...

Steve