Well, after I read that Mike W. worked on the -12V questions and got the cassette interface working on his Mimeo I thought I would try it on my replica 1 cassette interface prototype. The good news is I can get the cassette interface to work on my machine using a Panasonic cassette recorder. I will see if I can load wav files from something more modern like my cell phone. Stay tuned. I may finally have this thing working properly.
Vince