Strange noise from output 1 and 2 - everything is fine on 3 and 4

First, the easy part. You should be able to connect your headphones to the HP jack at the front and use that volume control just next to it. You might need to add gain to the main mix (can't remember the pot name) in case the levels are too low. Bring it up until just before pegging.

On the output hum, it sounds like you have a grounding problem and you are hearing what we call in the US a "60 cycle hum" It's called that because our electrical power out here runs at 60 cycles per second. Anyway, there are two answers. The first one is make sure your power supply is properly grounded throughout the entire pathway--from unit to wall. If you're using a power strip, try plugging the VS-100 in directly to a power source in a different room and see if you still get the hum. If it is not a poor grounding hum, I would contact CW tech support.

Good luck.