Hadn't seen the AOUT module before, thanks for the link. The MAX525 is 27 quid for 4 outs and out of stock at Farnell. The AD5668 is 20 for 8 outputs and they have them in so go figure. That guys site does look awesome though, his CV is bipolar and goes to +/- 12 V awesome. My x0x only needs 0-5V and I can just op amp up the other outs that I use to drive my wavefolder if I fancy.
http://www.oakleysound.com/wavefold.htm
Let us know how you get on 