Doubled notes through NDLR

[dontgodcj]

I have the NDLR and MRCC. I'm trying to sequence a synth (Polybrute) with the Octatrack and kept getting doubled notes. I finally figured out it was coming from NDLR. The OT is routed to all inputs (except its own) and so is the NDLR (plugged into USB). I read somewhere on the forums that the NDLR passes MIDI thru over USB? Is this what's happening? Strangely, I don't hear doubled notes on other synths so not sure what's going on. Please let me know what more I can provide to help troubleshoot!