you don't need a VU meter to set up the bass/kick relationship as shown on the vid...
in fact, the meters that are built into sonar are just fine,
and instead of some artificial setting in the vu VST to shoot for,
simply set the kick at -18, and add in the bass until you hit -15 combined,
it's the same thing.
the digital meters have control of rms and peak value hold settings,
set those up to somewhat match the velocity of the VU,
it'll be close enough for government work.