[LAU] NAM training and reamping

Hello, I'm trying to reamp my Line 6 POD X3 Pro, which is connected to Behringer XR18 via XLR. I created input and output file, their number of samples match but following https://neural-amp-modeler.readthedocs.io/en/latest/tutorials/colab.html always gives me: "XYError: Input provided isn't silent for at least 19200 samples before the starting index. Responses to this non-silent input may leak into the dataset!" (I have to check "ignore_checks" option, otherwise error is too generic). Maybe the extra latency introduced by PODs AD/DA is the problem, so next week I plan to hook it to my USB interface via S/PDIF and see if it makes any change. If I get the same error, what do you suggest? Did anyone reamp their gear successfully and produced .nam file on Linux (I'm using FreeBSD, but that shouldn't matter, right)? If yes, how? Thank you! Regards, meka