Thanks, ill keep that in mind. I have some TTY Apps for the PC, and I have a program that can make a *.WAV of TTY messages. Ive also recorded some TTY tones a few years ago.

Im going to see what i can do about piecing the hardware together, and get started on the software. I was hoping to have a scroll back buffer, but I dont know how to do that yet...

I dont have an O-Scope, but i do have Frequency function on my Multimeter. I do have a chunk of software that lets me use my PC as a simple sound-based O-Scope.