After a cursory search I wasn't able to find an answer to this minor issue, but please let me know if this has already been hashed out elsewhere. Typically, I have a babyface sending optical to the ADI-2 FS at 96khz, but I often want to switch exclusively to the ADI-2 FS via USB, so for convenience I like to leave both cables connected to the ADI-2 and switch the I/O manually and directly from the ADI-2's internal settings.

This all works as you would expect, but as I am just now finding out, this is true only with certain sample rates—in my case, 88.2khz and 96khz. As soon as I switch to 44.1khz on the babyface (while sending optical to the ADI-2) suddenly only the left channel is active on the ADI-2—in other words, no signal for the right channel whatsoever. As soon as I disconnect the USB cable (keep in mind, the ADI-2 is not even in "USB", or for that matter "auto" source modes—it's set to "optical") I get my right channel back when using 44.1khz. Again, this is not an issue when attempting this cable configuration at 88khz or 96khz, so I was rather surprised to encounter this.

So, is this expected behavior? Any solutions? I have updated the drivers and firmware for both of my devices as of today and that has not addressed this particular issue.