My iTunes dual soundcard tip from back in March seems to be no longer valid with Quicktime 7, at least with the public preview.
They actually removed the ability to select a specific sound device for use by Quicktime. I sent them an email, but Apple, not being a company known for taking feedback, hasn’t acknowledged the receipt of my email, let alone addressed it or, gasp, fix the issue.
I’m pretty peeved about the functionality being removed, but a whole not more peeved by the fact that there is nothing I can do about it.