Thanks, Melodica-Me. That’s the kind of information that’s needed. Maybe the old models are not gig-worthy. That’s something about which I would not be competent to judge. Their reeds may also not hold up the very aggressive playing. I’m viewing this as a casual, non-aggressive player. If some but not others are gig-worthy, then it would be good to know which ones. I spent quite a long time playing an A-25 (STUDY) the other day and did not have any moisture build-up or clogging, though I am having to work with a particular reed. It might be that if you were using several melodicas on a gig, it would be cool to pull out an obviously distinctive vintage model and use it for one or two tunes. Maybe you already do that.