It will depend on the type of tremolo you are playing and how many holes it has, below are a couple of sites that show the different layouts of tremolos, some play the same and some are mostly one note above a diatonic, remember that on a diatonic the #4 blow hole is a C, so match your tremolo C to that and convert the rest of the notes from that, of course the key stays the same no matter what harmonica you are playing. If this doesn't help, let me know, I don't get around here that much anymore, but I will get back to you as soon as I can.
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