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The new RTA, how accurate will it be, ie how many bands?
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Well, several things affect the resolution. The FFT Length affects the resolution along with the type of windowing you choose. REW produces its own periodic noise signals for the RTA, so you are able to choose a rectangular window to get the best resolution. It does allow external signals though. It also allows real time THD and THD+N results. It allows a fractional octave span down to 1/48th octave and a good selection of averaging.
Here's a quick sweep measure of my office sub, and then with the mic in the same position I turned on the RTA. You can see they're fairly close. It's handy to have the measure on the screen and then the RTA overlayed and then move the mic around to see the real time change....
SUB-office-with-RTA.jpg
brucek