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I should have read your post more carefully, I missed the xDR16 part.
I don’t know for certain if the expanders have the same issue.
I’d guess not (but that is just a guess). The limitation seems to be tied to the DSP engine location.

If I route an input on the iDR16 back to the master MixRack via the ACE bus, then I can control everything but the preamp. My understanding is that this is similar to how the xDR16 works (expansion inputs to master DSP via ACE) so maybe you’d just lose preamp control. Hopefully an A&H maven will chime in and give you a real answer.

Mark Turner
MixPad, OneMix
Mac Mini/Logic Pro 9