Thanks for the responses to my questions. I still don't know as much about Surface as I would like. Do the Pro and non-Pro versions run different operating systems? And where can I find the store?
Yes, different versions of Windows. To clarify, however, the
design intent starts at the hardware level. Surface with Windows RT is to Surface Pro with Windows 8 as iPad with iOS is to Macbook Pro with Mac OSX. Surface with RT is built with an
ARM CPU, just as iPad is, and its primary design intent is portability with
battery life: limiting software installation to store "Metro"-style apps means more control over the backend capabilities like power management as well as requiring touch-friendly design. Side note: Keep in mind that installing x86 software on the small Surface Pro (all Surfaces right now have 10.6" screens) means the menus are too small for touch manipulation, hence the necessity of the stylus.
The browser-based app store is
here, and you can search in the box at the top. Another way to search the Windows 8 app store is through Bing/Google, specifying "windows 8 app store" or "site:apps.microsoft.com". Unfortunately, you can't see the user reviews from outside the store itself through the browser, it seems (and user ratings can be hit or miss--I've seen a number of bad user reviews for some things that end up being user error, like not understanding the search charm).
If you're interested in the Surface 2 (Windows RT), you will need to research more about audio apps available in the store--and any questions need to be directed to that app developer (e.g.
Lexis Audio Editor's dev is pamsys, and the contact information is at the bottom). If you already have Windows audio software you like to use, you'll have to buy a Surface Pro or other regular Windows device.
As for the hardware side of things, what pallentx says is true--you won't be able to add any drivers outside what comes in-the-box for Windows RT. That's also something to think about.
Comment: The Surface 2 and Surface Pro 2 appear to be sold out in the U.S. right now. Short of finding something used on
eBay, and there are differences between first generation Surfaces and second gen, I think you're going to have a tough time finding any this month.