Use lsusb to find the correct BUS for pedalmapper

[willbarrett]

So that I don't have to worry about where I plug in the pedal.

Find the proper BUS:
lsusb | grep 'VEC Footpedal'

Returns:
Bus 003 Device 001: ID 05f3:00ff PI Engineering, Inc. VEC Footpedal

Which corresponds to:
/dev/usb/hiddev3