Backtrax

I just added a few more backtrax cassettes to my collection. These cassettes are so confusing, you very rarely see them on ebay and when you do find one, chances are you might never even have seen that specific cassette cover before. If any of my very few readers could fill me in on this, I'd be very interested to know if there are even more Backtrax cassettes than the ones I have so far..

UPDATE: Apparently a Yellow/Red version of Express Yourself/Cherish exists as well. The hunt begins..