Will a Marshall mg fully programmable foot controller work with marshall valvestate vs100 amplifier?

No, a Marshall MG fully programmable foot controller will not work with a Marshall Valvestate VS100 amplifier. The MG series foot controllers are specifically designed to be compatible with MG amplifiers, and the Valvestate series uses a different footswitch interface. To control the VS100, you would need a compatible footswitch designed for that specific amplifier model.