Did you get this sqaured away and sorted. You didn't mention whicg OSX version you are running. You need the Unversal Audio Driver, not V-Fire specific. If you didn't get this sorted out, let us know. I have my V-Fire working on my Mac just fine, so can walk you though the config and drivers stuff.
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Yamaha RM800 (For that good 'ol analog tape feel), Phonic, Presonis and Behringer Pre's AD/DA's. RME: Hammerfall DSP 9652. Every decent piece of DAW software out there but love Ableton and Software Audio Workstation and of course my Roland VS-2480CD + MB-24 and Presonis V-Fire for R-BUS I/O