CONCLUSIONS
It's been something like three weeks I've been on this project on (sometimes entire days!) and off, it's time I pass on to other projects and do some real work done...
Last week I have tried different Windoze XP packages and did the same with Windoze7. Honestly it did not get me any advanced than when I started, so I reverted to my initial XP install. The MBOX interface will absolutely NOT work right with AudioTester in any circumstances (although it works perfectly well with ProTools 7.4 in the same system), so I have to abandon this idea. Likewise, I could not go anywhere with the M-Audio MobilePre USB interface (never "found") and the Creative SB0270.
The AudioTester problem that it would not start in XP after install has been solved by the installation of winmls2004ver1.07installation.exe which installs the needed libraries.
The system works well with the Edirol UA-20, which has 24 bits but only 44.1KHz SR. It has both ASIO and DirectSound drivers. Edirol's driver development appear to be a notch above the others, so I think I'll stick to them. I have a UA-5 on the way which has extended sampling rate options.
I really like the touchscreen operation, which is fast and streamlined. Some operations are, however, really infuriating such as window resizing and selecting/ajusting tiny check boxes and sliders.
Of the lot of programs I tried, AudioTester continues to be my favorite, but Visual Analyzer seems a very capable contender. I cannot get used to the non "live" approach of Right-Mark analyzer, and I just cannot figure how to set REW's reference levels from SPL to electrical scale. This is a preliminary conclusions, YMMV.