The music light? Is it a signal indicator, or a clip indicator? If it's a clip indicator, then your gains are way too high. If it is a signal indicator, then it means congratulations, you have a signal.
edit...okay, so I found a picture on ROE, and it apparently is a music light. Do you have the manual? I couldn't find it anywhere. I'm pretty sure it is just a signal indicator. Where are your gains set, and how does it sound?