I see it has to be firm wood. Figures it's a thing about the structural integrity of the carving. Some of that wood is used for important stuff in luthiery: making bridges, fretboards and as ornaments.
I have to photograph the one that makes sound. I did 333 pieces of inlay on it and one larger inlay on one side. It's a miniature carving. I've done larger works, but working miniature is far more challenging for me. I'll do a post about it at some point.
This has me even more interested in taking a look at it.
Any kind of woodworking tends to get you into other crafts. It's part of the beauty. The same is true form other crafts getting into woodworking for any reason. It's interesting how that works! A total lot of fun!
Craziness is one step to greatness! 😋