VS-880 Mix hum problem

[bevett]

I have a VS-880 EX and I'm trying to bounce a track over to track 8 so I can free up some effects. I'm using Input to Track mode and I've set the channel 8 buss to Mix L and I'm getting this dreadful hum. I successfully bounced an earlier section, so I have no idea what's different now, and I can't make it go away. Any help?

Thanks,

ben

[Yasoo]

Just a suggestion because of hum I had one time: I had a DC power supply plugged into the same power strip as my recording equipment that gave me hum for some reason.