I just went back to 8.01 and then reinstalled 8.01A and made a preset from scratch using the TM block. I set my distortion to the Y and clean to X...the patch starts out sounding fine but when I switch to X and then back to Y it is noticeably louder...seems to be the same tone but there is still definitely something not right even with 8.01A.
Are you using Axe-Edit?