Ok, I've found what was causing my very slow fps.
Thanks to Lim Dul for the hotfix links, unfortunately didn't work for me, so I installed older graphics drivers 169.25 (was using 169.28), and ran then. Ran faster but not much faster.
Disabling SLI was the crucial link. Audiosurf has a REAL problem with SLI, and disabling it causes a steady 60 fps most of the time, although the beta is still better optimized than the new version. Disabling SLI on the beta also gives a boost, so this is definately what is causing the problem for me. I realise that people using SLI will be in the huge minority, but a fix would be much appreciated, as atm I have to keep on switching between modes if I want to play any other game, eg COD2, which somehow maintains a solid 60 fps at 1920x1200 at max settings, something audiosurf just can't seem to do...
