Seems like it would be too hard surfaced. I have a big "C-Shaped" contraption I made for vocals that had soft foam glues to it (I still have that) and back in an older day I also took a bifold door and stapled a soft quilt to it that would go behind the singer. Inside that Frankensteinded vocal booth it was completely dead.

To look at it from overhead it would look like this

C->

where the hyphen is the singer facing the C. Whatever reverb I wanted I then added in the box.

I had a big piece of some kind of flexible stuff that I glued onto the kitchen wall behind the stove. I built a wooden "cage" from 1x2s, screwed that plastic stuff onto the frame to make an arc, glued on 24x24' packing foam from laptop boxes with spray adhesive and made a wider version of what the music stores charge $100 for. Works well and I made it from stuff I had at home.

I am using the new 1040XTRAEZ form this year. It has just 2 lines.

1. How much did you make in 2023?
2. Send it to us.