[maxmsp] Re: Controlling Analog synths from Max?

One thing that hasn't been mentioned yet, that you may consider,  is 
using an R2R network to do DDS-style output using however many digital 
I/O pins you have access to.  Here is one project that does something 
similar using an AVR chip:
http://www.myplace.nu/avr/minidds/index.htm

Should be easy to apply the same concept to Arduino or whatever 
programmable digital i/o device you have.  The resolution limit will be 
imposed by the number of output pins/resistors available (1-bit per 
pin), so Arduino would be capable of 13-bit precision if you use all the 
digital I/O pins for signal generation.

Best of luck,
andrew B.