I came accidentally across this thread and I must say that the RT EQ settings can be imported from one driver to another.
All you have to do is to save the FxProperties key with all your settings somewhere in your pc and upon installation of a newer driver you replace the new FxProperties value. You will need to change the .reg extension of the file to .txt and in the first line of the file you replace the older FxProperties value with the newer created by the new RT driver.
Save the file, change the extension to .reg, open regedit as admin, and highlight the FxProperties key.
Click import and you should have the message that "the values have been successfully merged...etc".
Reboot your pc and you will notice that all your previous EQ settings are there and work!!
I tried with 2.71, 2.73 and 3 Sony Realtek drivers and it works flawlessly.
AHA! Sounds like the FxProperties value in the first line was probably the particular piece of magic none of us ever thought of. Excellent work!
As it turns out, I only use one single "fixed" EQ setting as my standard setup. I don't have a whole collection of different EQ's (although perhaps others might).
I've simply written down my own standard EQ setup, as represented by the number of up/down clicks on the arrow keys for each frequency band, and I refer to it anytime I upgrade to the latest version of the Realtek driver in order to recreate that EQ again. Takes 30 seconds and I'm done, and doesn't require REGEDIT... although I do commend you for your discovery.
It would be nice if hovering the mouse over one of the Realtek EQ frequency bands would reveal in a flyout what the +/- value is of that slider, but unfortunately it doesn't. Hence my little "cheat sheet" method that allows me to simply press the up/down arrows on the correct frequency slider some proper number of times (while I'm watching the onscreen slider move, to confirm my action) in order to recreate my EQ anytime I need to.
31 - +1
62 - +4
125 - +1
250 - 0
500 - +1
1K - -3
2K - 0
4K - +5
8K - +6
16K - +2
Nevertheless, your revelation about how to actually preserve/restore any and all current custom EQ setups is very nice information to have. Thank you for sharing.
This thread has been around for quite a while, and nobody had been able to "solve it"... until now.