We cannot support backing tracks at this time but will be able to soon, it is on our list and progress is constant. We just released version 4.2.4 and it is behaving very well so far!
We are already testing 4.3.x internally and version 4.4.x and 4.5.x are being worked on internally as well. We have every intention of meeting the original promises of the product.
You may find a better solution in Ableton, you may not, but in the end we always believe you should do what is best for your setup!
Thanks for your feedback!