It's now my production LMS server, running RPi OS Bookworm and SO 1.3.0. The little extra grunt over the RPi 4 with the same 8GB of RAM (that's not the same memory, you'll understand, but the same amount of memory

I haven't yet tried playing with the kernel, and don't think I have any compatible audio HATs (that's irrelevant because the server isn't near any of my hi-fi where I run RPi 3 and 4 client machines with their HATs).