Mine sounds very different between 'all audio' and 'chat audio' initially i preferred all audio as it sounds a little more natural to me at least, once i got used to the slightly metallic sound of the 'chat audio' I really liked it, which I assumed was the marmite Virtual surround sound. I thought 'all audio' channeled stereo through and 'chat audio' 5.1 VSS? I've tried it on both, initially preferred 'all audio' got used to 'chat audio' and now prefer that. Our ears are all different, I just feel I can hear subtle things I couldn't before. I hear people picking up ammo, adding attachments, reloading and changing weapons from some decent distances now that I couldn't before. I'm going to keep flicking between the two as there both effective and I've given 'chat audio' more play time than 'all audio'. All audio is definitely louder I just thought it was stereo from recent posts I've read and wanted to get used to vss.