External Effects-Routing-Newb

I’ll give that a try.
Will there be latency issues?
The other night I just ran cables from stereo out back to stereo in and recorded that. I had the reverb box in the chain. I was getting a little feedback in the signal.
Is it good to do that? Or was that stupid?
I had 4 trax. I ended up with a 5th track of the “return” that was wet. But it also contained the audio from all 4 trax.
That ended up sounding a little muddy.
That’s what I’m going to end up with this system you described above right?
The 4 dry trax, plus a new “returned” track that is wet?