Hooked up the G6 to my PS4 Pro for another quick test last night. Tried it via USB and also both USB & Optical. I could used the Party Chat 'Adjust Game/Chat Mix' in the PS4 software when just connected by USB but it was greyed out when connected by Optical and USB. Is this right?? If so, by connecting via USB I guess I'm missing out on Dolby Digital output?? Anything else??
Adjust Game/Chat should be grayed out (unfortunately) when the G6 is connected and the settings are correct. It is the same with MixAmp.
USB only should be stereo. I don't know how the sound quality is though.
The setting "Volume control (Headphones)" should somewhat affect the game/chat balance if I remember correctly. If it affects only the USB audio, it should only affect the chat volume (optical game and USB chat).