That is actually a complete misnomer because not only are there no tubular bells, there is no option to add any either. But it is Mike Oldfield we're talking about and I've always wanted to say that.
Bought Mr Oldfield's latest, Light & Shade, with my birthday money. Four of the tracks are available in, apparently, U-MYX format. This is nothing to do with rabbit diseases but is in fact (very limited) remixing software. The different tracks are broken down into segments and you can fade them in, out or completely shut them down as you wish. What you can't do is reorder them, or introduce new stuff - hence, no tubular bells. All in all a bit of a waste of time, but what the heck, it's a nice novelty.
If you really want to waste your time with a bit of remixing, try these guys. I once set our company's development programme back by a good 30 minutes by circulating this to the Strategic Technologies division.