I used it for 2-3 records vocals and guitars.
I have an AT 2020 and now langevin CR 2001.
Micro who are not in the same range and as we could expect if the AT 2020 is well below langevin and CR 2001 is well above the AT 4040.
The 4040 AT gives a sound a bit muffled, it puts everything into the background, so it seems good for instruments (guitar in my case) and secondary voices. on the other hand for the main voice, I struggled to make out, it is not very good at it.
I will not repeat this choice because I record mostly on main instrumental voice, so it is not the most suitable micro. It's still a good mic with a specific sound.