Alright..... before I say what is wrong I will tell you what Ive done to try and fix it. I have reset the CEM, reset the express completely, swapped the dimmers, swapped the s4's and replaced lamps. (This is a non + Sensor rack, well two racks.) Ok... channels 9 through 21 on the catwalk wont go past what looks to be 10%. All the others channels work fine. Also, there is no patch board (all soft patch) and the system is the original install from 2004.