What I found more interesting is that the latency through these two processors is not the same.
Base latency, analog in to analog out, of the DLP is 1.1ms. For the LM26 it is 1.02ms.
If I turn on "Latency Matching" both processors exhibit a latency of 2.02ms analog in to analog out.
Things get tricky when I use Dante, however. "Latency Matching" does not account for the latency of this interface, so even with it off the DLP is still exhibiting 1.1ms while audio from LM26's analog outputs arrives after 2.69ms. Activate latency matching on both processors and the spread seems to increase to 1.65ms. That may be meaningless in some circumstances, but in many you must be very careful to account for it, and interestingly enough it is
twice what Dante indicates to me its latency should be... hopefully it is not variable! I am not using any FIR filters in either processor, so I do not know if latency matching accounts for them as well.
For an exciting visual example of this, here are two traces. This is the same magnitude response as in my post above. The purpleish trace is the phase shift due to the differing delay through each processor, analog in to analog out on both (.08ms). The greenish trace is the phase shift due to latency induced through the Dante interface (about 1.6ms). It gets much worse if latency matching is enabled on the LM26 and not on the DLP, but that would be a stupid thing to do so I certainly didn't do it.
The good news is I had a great conversation with Josh Evans this morning about these issues, and he has promised to talk to the head honchos about allowing latency matching over Dante, as well as allowing aux outputs to be grouped, and perhaps some other things that would be handy. Until a solution appears, he has told me to "use AES to link Lake processors". I therefore pass this advice on to you.
Oh, also he taught me about how to create modules with variable numbers of aux outputs, which eliminates half of my problems with the Lake processing. I should have figured this out, but this is why it's good to have friends in high places.