I have seen videos of Tommy Cho, yes I agree that they are regular Melodicas in custom made housing. I don’t hear any thing very different from the housing but the sound in the videos can really change depending on the platform you are hearing it on from what is actually produced live. I would love to hear one live. He has another one with a plexiglass housing with the similar look. He is quite the performer very animated. I think he has a website I know he is on Facebook. Maybe he will join us here on Melodicaworld, I will message him and see if he will join us.