fireberd
Both my Roland Octa-Capture and Studio-Capture work on the Win 10 Preview.  I'm on the latest 10166 version.  My Behringer BCF2000 works on Win 10 and even my Frontier Tranzport works in Win 10 but I had to install it in a Vista compatibility mode. 
 
When the RTM Win 10 is released I'll be moving to Win 10 for my primary system.   The Win 10 Preview I have installed is on a separate hard drive, not one of my "operational" drives.

Try AZ Controller from member azslow3. He has it working perfectly for the Alphatrack and I'm sure lots of folks have the Tranzport as well. If it doesn't work out of the box, he'll probably tweak it for the Tranzport. See the link in my sig.

There is no problem with my Frontier Tranzport.  I don't need another driver, it works perfectly using the Vista compatibility mode to install.  I had to do the same thing in Windows 8/8.1. 
 
 

Neither Universal Audio or Lynx Studio are commenting on Windows 10. Both of them tend to be slow with testing new drivers, UA being the slowest. In reality, Windows 10 will offer no real advantage over Windows 8.1 other than cosmetics and those aren't required for audio recording.

I bought a Edirol midi board thinking since Roland owned Cakewalk some things would work together better and that didn't really happen and they are not as fast on driver updates as I would like. Now that Gibson owns Cakewalk I'm thinking of buying a new Les Paul. It's kind of a thin justification, but I think I'll stick with it. 

BassDaddy
I bought a Edirol midi board thinking since Roland owned Cakewalk some things would work together better and that didn't really happen and they are not as fast on driver updates as I would like. Now that Gibson owns Cakewalk I'm thinking of buying a new Les Paul. It's kind of a thin justification, but I think I'll stick with it. 

I like the way you think.