I have been following this thread and I also have a Roland UA 700. I have been using it
with Vista 32 for several years without a problem. I switched to a Dell XPS laptop
with Win 7 x 64 and have been using a Soundblaster Express card.
This morning I hooked up the UA 700 to my laptop and downloaded the W7x64 driver and started up BIAB and it played with no problem. I opened Real Band ( witch I never Use )
and made the selections in the preference file using MME and Hyper Canvas and played through two songs and exited the program and everything sounded great with no Error
reports.
I did not have any input devices chosen and maybe that can be the problem you are having. I have had ASIO problems before using a Guitar synth. and Vista but haven't
tried it with W7x64.
Hope that this helps. Dave.