ProTools 2018 And Behinger UMV404HD Hardware Inserts

[Embee]

I have a question about hooking up my external compressor with my existing set-up. Mac Pro Trash can 2013, Mac 10.3.6, 100gbSSD, 64gb Ram, Protools 2018.12.0

Had the MBox Pro Gen3 updated working, but when I upgraded to Mac 10.3.6 and Protools 2018.12.0 (Not HD) the MBox would not be recognized by ProTools. I followed the threads here to upgrade it, trick it into upgrading, etc. Nothing worked.

After research, I found the Behringer 404 was a plug n' play stop gap. Not the best, but at least I can work.

I am trying to "Insert" my Warm Audio WA-2A compressor via the "insert" points on the back of the Behringer. I am using a TRS cord that "Y's" to just the tip, and the ring, separately. Single TRS to the insert on the Behringer, tip to the in on the compressor, Ring out of the return.

Using the I/O in PT, I tried designating insert/input 4 to the task, according to the manual. (All of this is taking place behind the Behringer.) When I use it as an insert on the vocal track, it seems to only affect the output/gain on the signal, (as I am manipulating it on the WARM.) Then, when I am playing the track back, I hear nothing even though the output is routed in a standard 1-2 on the track, and there is recorded information.

Any light on this would be so appreciated. Thanks.