There is Phasescope, from digi that has a VU mode, although it cna be a bit slow to react sometimes. InspectorXL doesnt have a VU mode as normal, however, the k-20 is pretty close appart from the inital ballistics attack time (if i said that correctly) You can also make up your own meters using it, with various weightings, rise and fall rates etc to get you pretty close. Or... just buy and wire up some VU's