I have tested SBX Pro Studio on my system with all options and found it to work well, but I generally use "Stereo (2.0/2.1)" in the speaker and headphone tab. SBX enhancements can create a confusing output, and by that I mean a front/back separation that doesn't quite sound right. Turn off Crystal Voice. Do not use Scout Mode. You are correct about the Encoder tab. Pretty much I think you guessed correctly.
Once the game is out of BETA then you can go back to playing with those other settings, but this will help to make sure that the card is not causing anomalies. This is just to stream line bug hunts.
Does your advice to turn crystal voice off apply only to AH3? In AH3 I just tested the mic by tuning to myself. My voice transmission sounded great initially with SBX and Crystal voice on. But of, course, I don't know how it effected the game sounds.
Tonight I turned off SBX and crystal voice and logged in to AH 2. I tuned to myself to get the volume adjustment right. Didn't want to blow anyone's ear drums
My voice was distorted and there was a horrible echo. After adjusting the volume I tuned to the squad channel and a squad mate confirmed that my voice was somewhat garbled and there was a significant echo. I then logged into AH3 with SBX and crystal voice turned off and, tuned to myself, noted the same echo and unclear transmission.
So I enabled both SBX and crystal voice and in AH2 the echo was gone (Crystal voice has an echo reduction feature.) and the transmission was much clearer both to my squad mate and tuned to myself. Then back in AH3 with SBX and crystal voice on The echo was gone but my transmission did seem to break up a little. (Again tuned to myself.)
I did all this using both the SBz microphone and my old Labtech microphone and heard no significant difference other than my very first experience in AH3 yesterday. Then, with SBx and and crystal voice turned on my transmission using the SB mic sounded better than ever before . But that's not the case now.
In the middle of all this back and forth I lost microphone function completely in windows and had to reinstall the drivers again. Don't know if that relates to any of this.
Should I be ignoring the quality of voice transmissions in AH3 for now? So far this discussion has been about vehicle and plane sounds so I realize I am digressing a little.
I don't recall if any bugs have been reported for voice transmissions.