The more I play my Jazz bass the more I have the feeling that I get a better tone by slightly rolling off the volume knobs, let's say at 85-90%. It sounds mellower and it somehow gains more low end. The better sounding configuration to have a fat bottom end seems to be Bridge PU 20% and neck PU 90%. It gets more mid-rangey if I turn the Neck volume all the way up. Did anybody else have this feeling? Thanks.