As already said - no voice/game balance control on the G6 - ruins for me what is a great device otherwise (which is why I'm selling mine). Think it's a massive oversight from Creative - claiming voice chat support (which it has) on PS4 but leaving out a key control. Several times online I had to revert to using the controller audio mid game just so I could adjust things properly!
I've ended up with a Steelseries GameDac now (fortunately at a bargain Black Friday price). Not quite in the same league as the G6, not as competent amp wise, but has a great OLED screen and east voice/game balance controls. Still sounds decent when I've tried it with my Game Ones (and other headphones) but only just powerful enough for the Sennheisers in my testing. Also, not a fan of the surround processing on it (so running in stereo) - then again, I didn't like the VSS on the latest Mixamp TR either.