Actually the  18 00 08 00  is  not on the chart, I made a mistake that is not what I'm erasing ( the 18 00 02 08  "MFX control 2 sens" ). 
The one that I'm erasing is the 18 00 08 00.  So than what is 18 00 08 00? It works, but I have no clue what it is and why it works...
18 00 02 00  SysEx definitely deals with Tone Parts Effects MFX1 and MFX2.
sorry 'bout the mistake.