USB Passthrough for (low latency) sound cards?

[VirtuallyMachine]

I'm stoked about the potential for high performance graphics on guests using GPU passthrough. However, I've not seen much discussion on USB passthrough. As I understand it, one can achieve the same latency from a USB sound card on a guest as a host - is that true? Some of these USB sound devices can achieve <5ms latency

 

[mbosma]

Not a very scientific answer but I have a gaming vm wich has GPU and usb passthrough for keyboard, mouse and headset.
Using a usb audio adapter or a usb headset works absolutely fine. I'm not able to feel any difference in fps games while having it setup to a physical gaming pc.