Hello! I know it's been some time since the release of the SINE-O-TRON 3000, but I'm hoping you're still offering support :)
I gave it a good shot, and thought I sort of understood what was going on — I did a few times correctly pick which solution to enter the first time. But in the end I was unable to find a consistent relationship between the phase and 12.1 code and the required 12.2 code. And some of the patterns didn't seem to match the 12.1 frequencies, either. By trial and error I made it to the 'exit' point, at which point further input was ignored and I was instructed to 'reboot the host computer', which I'm unwilling to do — merely quitting the program seemed to restart the sequence, but I'm curious if it's actually detecting uptime :P Would you mind, all these years later, spoiling the puzzle? Perhaps in rot13, or behind a "read more"?