I got the chips off a DW-8000 filter board.
I think I'm going to make a bunch of PICs to control it via CV's
Check this site-
http://www.electricdruid.net/Tom has open source code for PIC16's. A LFO chip, an ADSR chip and even a VCO chip (with it's own built in filter).
Get a $25 programmer, a handfull of $2 each PIC16's and make about 4 LFO's, 4 ADSR's and maybe even a few VCO's.. all really cheap.
Add in the supporting circuitry for the PICs, the V+/V- supplies and op amps for the PIC's PWM outputs and finally you have CV's you can get control of.
Cross modulate LFO's to ADSR's or reverse.. imagine there's many different ways to conduct the CV's before they reach the control pins on the 2069's.
VCF can be modulated as well as Resonance and the VCA.
As for a datasheet.. all you need is the schematic I posted above and look at a Korg synth that uses the chips to see how they hooked it up with supporting components.