I've been working on a vocoder and here is a progress report. My prototype boards wet my appetite but soldering and desoldering got to be too much so it was back to the breadboard (14 breadboards to be exact). Please let me know what you think in the comments. I think it's turning out pretty cool.
The whole project is online now here: http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=VOCODER2013/VOCODER2013.php&CATPARTNO=&PN=1&SONGID=NONE