The VT has a buffered output, which would put it more in line with an active bass, so a passive DI may be a good bet. I've used a VT with a Radial JDI in the past, and it worked just fine. I've also used that JDI with nothing but a passive bass, and it was fine. That said, if you were to use an active bass like a J48, or a Countryman, I'm sure you'd be just fine.
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