TL;DR I’ve you’ve ever wanted to connect a MOTU AVB device to your Avid S3L, then I’ve got the video for you.
In the video I demonstrate connecting a MOTU Stage-B16 to expand both the input and output signal count, as well as how to record from the MOTU in addition to other stage boxes.
The process requires changing an internal configuration of the Avid S3L, but this is a simple one-time process that is reversible if needed. Once the change is made, it should be possible to connect practically any AVB device to the S3L. The process required some trial and error, and some help from the Avid forums, but it works consistently and I’ve used it for a while now.
Please watch the video, and let me know in the video comments what you think, and what other kinds of videos you’d like to see.