FFD in 3DMax

When i use FFD 4x4x4 in 3D Max 6 to sculp my head model, which is used for morph target, it change the number of vertices of this head. So the morph cann't work!
Help me, i dont know how to do that but not change the number of vertices?

but.... You use edit poly with nurms subdivision surfase?? if you use this the morph modifier can't work.......could you try to use ffd 4 and next meshsmooth.

....or..... have you a problem just with ffd 4 modifier??

Bye :D