Sorry for the long delay, but this model is my first melodica. Got one for a low price though the case is lacking some clips. I have it in storage now, hoping to one day retrobright the keys, which, as you said, would go dirty toilet-yellow. Another annoying thing is that the plastic is brittle, and because of that its spit valve snapped off, so I plugged the drain vent with a piece of neoprene and momentarily covered it in vinyl sticker. I’ll have it re-attached with fiberglass one day. But it really sounds good.