Does removing "interface jitter" help, if my source has jitter?

I'm thinking of getting a Benchmark 3 DAC, and one of the selling features is its UltraLock3™ jitter attenuation system, which Benchmark says "fully isolates the inputs from INTERFACE jitter" (emphasis mine).   If my upstream source has jitter, will this system isolate that from the DAC?  My usual source is a Blusound Vault, and I suspect its jitter control is not as good as the Benchmark's. 
@yyzsantabarbara Thanks for sending a link to the Gustard review; it sounds like a very impressive unit.  Do you know anyone who has heard it?
@cheeg I will hear it myself on Thursday. I bought it a few days ago and it is being shipped from China. It will need some time to burn-in.

I have a 30 day trial period with this purchase.
@yyzsantabarbara That's great! Mind if I DM you next week to get your impressions?
@cheeg No problem. My frame of reference is the AudioMirror Tubadour III SE tube DAC that is really growing on me. At the other end is the Benchmark DAC3B that is amazing on great recordings and a little strong on bad recordings. I am hoping the Gustard is just right in the middle of those 2.

I was hoping to use the CODA 07x preamp with the Gustard and RAAL SR1a but the preamp is delayed another 2 weeks. So I will be focusing the Gustard on my floor standers with Benchmark gear (HPA4 + AHB2).
Just like with anything, when you’re wondering about jitter... first get used to the sound of your system/gear as is. Then make a change and see if you hear any difference. If your DAC really does turn out to be "immune" to jitter... then changing USB cables (or whatever digital cable you’re using) should have no sonic impact. That’s an easy thing to test... just barrow a few alternate cables and swap. If you hear no difference at all, then that’s a coin in your "immune" jar. If you hear any difference at all, your DAC is not perfectly immune.

I’ll just say that I too had hoped that USB had finally found a way to defeat jitter by placing the master clock in the DAC and pulling packets etc. Well, at least with my DAC (Hegel HD30) USB cable swapping was clearly audible with a few cables I tried, and more dramatically, adding the PCT USBe in the path (between Aurender and DAC) has revolutionized the sound. A lot of marketing hype will throw out words like "immune" and perhaps your device is designed in such a way that it truly lives up to that claim. But even my Hegel DAC was supposed to be relatively unaffected by upstream jitter via USB given it’s design, and I’ve found that to be not the case at all.

p.s. I’m using the phrase "jitter" to broadly mean anything that allows the data to still arrive at the DAC uncorrupted, yet somehow the sound of D/A conversion is affected by other factors that are not digital in nature. Jitter (timing of the data) is most often discussed, but there are other non-digital variables as well such as noise. It’s entirely possible that what many of us hear and call "jitter" when changing cables and transports is really just changing the type of electrical/mechanical noise that gets sent along with the data to the DAC. Galvanic isolation is an example of a device that attempts to address this type of variable.