I have two of these fantastic units, one on my kitchen TV - no problems as connected by optical; with other one serving my PC delivering sound via Bluetooth, which means lips are out of sync to screen. Can I connect this via a Toslink to HDMI from PC (in order to provide optical connection to PC to soundbox) and still control sound levels from PC acting as an 'amplifier'. Thought I'd ask before buying Toslink to HDMI adaptor. If it helps anyone, I find these Skybox units a really great medium for providing sound (albeit now discontinued but available second hand as 'cheap as chips') TIA and many regards. John.