Well, I must say, it's quite difficult to hear others, although in theory the system works well. Here are some tips I developed that might help you hear others
1) Hold down the microphone hotkey a bit before and a bit after what you say, because of the lag
2) Make you the music and sfx are off for best performance
3) Set your voice volume to about halfway, and your voice sensivitity control to a bit lower than halfway.
I tested this out with some other Graalians and they said these all helped, which is a good thing. Also, don't stick your face right into the mic, talk from a distance even if you have to talk a little louder otherwise no one can hear what you say
Post some more tips or suggestions if you have them