I think the problem is that to load the cdt in Winape you need to type RUN" , press any key, wait 2 seconds, then press 'play' on the tape control. Please, tell me if this works, ty!
Yes you are right, waiting a couple of seconds before pressing play, it works. But this is the only one I've tested that requires this pause.
Anyway, thank you, and congratulations for your game.