  In this work we investigate the effects of a Fermi velocity modulation in a
valley filter in graphene created by a combination of a magnetic and electric
barrier. With the effective Dirac equation of the system, we use the transfer
matrix formalism to obtain the transmittance. We verify that the valley
transport in graphene is very sensitive to a Fermi velocity modulation, which
is able to choose which valley will be filtered with perfect filtering. Also,
it is possible to use a Fermi velocity modulation to filter both valleys or to
make the valley filter transparent. It reveals that the Fermi velocity is a
powerful tool that can be used to tune a graphene valley filter, since it has a
total control in its transport properties.
