Hi. I am getting alot of extra noise and hum when I record into my computer. This is my setup: - HP Computer - Behringer Xenyx Mixer - Behringer MX16 Speakers It's a basic setup, and I'm getting quite a good amount of hum and noise. It's not just while recording or only on the tracks I record - it's all the time. What am I doing wrong? What can I do to fix this?