Try and record the stereo output of your sound device to a new track in RealBand and see if that's better.
Set the Audio Input to the stereo output.
You can use ASIO4ALL also.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
RB_Stereo_Rec.jpg (442.81 KB, 160 downloads)
RB_Stereo_Rec_Track.jpg (447.58 KB, 162 downloads)