Thanks for having a look, James.
Re: Boring, well, it's a drill
I made it mainly so I can get to be a pro at analysis.
Sliders: They're a bit touchy, it's best if you just click where you want them to go instead of dragging.
IE: *should* work fine, I'll test a bit more though. Firefox/Opera is fine.
Ledger lines: A bug there with inversions, I'll see what I can do