Thanks for asking and I'm really glad you're working on the lesson and that it has helped you to reach another level! Great work!!
As of now, I don't have that recorded in a slower speed - sorry! Half speed should sound OK when changing the tempo in the player at our site, but I get what you mean when we change to 1/4 of the speed it's difficult to hear what's actually happening. Sometimes it helps to just practice using the metronome for awhile and then go back to the backing track. Try it in a slower speed using only metronome and then see how you do when going back to the lesson backing track. Kind regards/Emil