TonePort DI (Gold) causes sometimes (and very often) some hiss noise in one of it's channels. It doesn't matter if speakers are connected to the separate analog outs or in a single out for headphones - the problem remains anyway. I tried installing different driver versions, repairing permissions, changing buffer and sample rate. Nothing worked for me. Now I'm using latest drivers (7.1.7). I used my TonePort DI (Gold) earlier in Windows and nothing like that happened for several years. So, I think this is a soft-like problem only.