The L2 CONFIGURATION on the V-AMP PRO would work best.
Connections would be as follows:
instrument --> amp input --> amp fx send --> v-amp pre dsp insert return --> post dsp insert send --> amp fx return...
Ensure that the front panel LINE switch (far right-hand side) is set to "REAR" so that the V-AMP's "insert return" is used for the input instead of the front panel instrument input.  There are some diagrams called "additional information" available on our website at the following link that may help as well: