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in reply to @ticky's post:

First of all, shoutouts to the cowon X5. I've got mine around somewhere although I got it a bit after it's time.

Second of all, if you retroactively give it a number, you can put X1, X2, and X3 all down as Dance Dance Revolution games. This helps relieve some confusion.

And at that point you can make a number of reaches to make everything else music related. Except for X11, it's just been here since the dawn of time.