I'm trying to get that run at the beginning of ITPOE1 on bass. The rest is pretty basic, but that one run is really tricky. I've got the muscle memory no prob, and I can play it at the right speed after a couple of warm up runs, but I'm really, really sloppy at it. I need a lot more consistency, I always either do it too slowly, or hit a few duff notes towards the end.
Ah well, I'll get there eventually! Practice makes perfect etc. I'm a lot better now than I was a month ago.