USB Headphones Problem
I'm running Sierra on a 2012 MacBook Pro. Recently when I've plugged in my Logitech USB headphones, I find the stereo effect on music sounds weird and voices are rendered almost inaudible. If I shift the balance off-centre, things improve drastically, but it's still not perfect.
I've reset the PRAM and SMC, but no difference.
I've seen variations of this problem on here, but not the exact same one. Anyone able to help?