I've got a mmf 9, and I would imagine the vta adjustment would be the same for the 9.1. On the mmf 9, you adjust the vta by loosening the two (2) Allen screws on the back of the pillar that supports the tonearm. Instructions for doing so are contained on page 11 of the instruction manual that came with the TT. Check your manual to be sure it's the same.
BTW - - I've been totally satisfied with the sound/performance of the mmf 9 for the past (almost) 3 years - - - very fine "turnkey" TT at a good price.
BTW - - I've been totally satisfied with the sound/performance of the mmf 9 for the past (almost) 3 years - - - very fine "turnkey" TT at a good price.