Wayne,

It sounds like your drum sound source is in stereo and stereo can not be panned completely to one side. Your bass is a monophonic sound source so it can be panned completely to the left or right.

What you need to do is to either go to your drum sound source and pan everything dead center or save the track as a mono wav and hope that you don't get into any phase problems. Personally I would go to the drum sound source and pan everything to dead center.

Once you have either the drums panned to dead center or a mono wav you then can pan to the extremes.

I hope this helps and good luck.

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