I'd take your time leaving the feedback. They won't be going anywhere. Also, make sure it's supposed to work with the 32, though it sounds like it's working. You need the levels on the 32 to stay low, between -3 and -7 on the 32 vu meters, when you're recording. Anything too much higher or in the red on the 32 can cause that breathing. It's the operating level the DBX unit works with. It "encodes" while it's going to tape then "decodes" when it comes back into the dbx unit. Did you record what's on the tape with the dbx unit? It wont work right playing back anything that you recorded before without it. It has to be encoded first.
Just to set it straight. The "input" on the DBX goes to the output of your mixer. The "output" on the DBX goes to the input on your mixer for playback.
The encode out goes to the input of the 32. The decode in goes from the output of the 32.