Thank you very much for your reply!
Also, I apologize for my poor explanation.
When I tried to profile, there was no sound, so I gave up on the profile itself.
Then, when I started kemper the next day, all the rigs that had been sounding fine now sounded bad.
I tried headphones, main outs, monitor outs, all of them, and it was still no good.
I thought it wasn't good, but when I did the first step of the profile without the cable connected to the send return, I could hear the sound even though it wasn't connected to the amp, so I thought it might be some kind of strange setting, so I asked.
This is the first time I learned that using an attenuator is not recommended... Thanks for the valuable info!