Thomas Henry still has some Reticon SAD-4096 chips for sale at
Welcometo Midwest Analog Products! in the parts section. He also posted thefree plans for this unit there along with the PCB artwork. It is basedon Craig Anderton's Hyperflange. I built one about 2 years ago and havebeen pretty happy with it. Also the Roland SBF-325 is a great unit. I seethem fairly often on Ebay. I got mine for $250. Now modulating these deviceswith my 320 and they are twice as good! Sounds like Paul may not go downthe BBD path which is sad but the parts issue is a real thing. Charles.