To put it bluntly, I don’t think anyone in this thread understand how this feature works.
If you have a interface with a fixed-latency driver (which is the case with my Apollos), Cubase already knows about your interface round trip delay. This is the starting point ‘guess’ that Cubase takes to give the correct delay compensation in your DAW. So if you do a Ping test and get a ‘0’, that means the guess was correct and everything is working as it should.
So again if you directly route a cable from your interface output 1 to your interface input 1 and did a ping test, … it SHOULD report 0. Whether your buffer setting is at 32 samples or 1024 samples. Cubase already pre-emptivley knows about this delay… so the Ping test is for calculating any ‘extra’ stuff…
If you have mostly Analog Outboard gear, (which has no inherent latency or delay) this should mostly read 0. However, if you have something like a ADAT output converter, or other digital process or digital FX that has some latency to it…this is where Cubase tries to calculate that and compensate it for you. Its possible your interface itself might have some onboard-DSP processes that introduce extra latency beyond the advertised ‘guess’ too.
At leasts that is how I understand how it works.
If you have an interface driver that constantly changes latency…then Cubase cant really help you much. Otherwise, like someone said, just make sure before a final bounce to Ping everybody.