I’ve noticed that when many sounds first play, about a half-second of them are ducked. Youtube videos, MP3s, VMs running Windows. It’s brief. It’s not a gamechanger. But I would love to know what the duck is going on with this motherducking half-second fade-in that happens with any new sound played. I believe Debian 12 is using PipeWire. Anyone else know a good way to unduck this? Thanks! 
What audio device is it? Does it show multiple audio devices? Is this a TV with speakers? I know some TV’s have some sort of sound leveling to tone down commercials and it can act like this with it enabled.
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It’s through the onboard Realtek chipset coming out of two nice speakers via the 3.5mm jack. Listed in Settings as Line Out - Starship/Matisse HD Audio Controller. I double-checked it with a Windows boot and it’s fine over there. Just in Linux.
I guess you could try a different kernel to rule that out. Apparently it isn’t the first time there has been a problem of this nature. It may have had a regression since 5.8.11:
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I guess it’s possible. Yeah, last time I did a kernel upgrade, maybe about a year ago, they introduced a problem that broke sound altogether. Threw me for a loop because it never even crossed my mind that would happen, but it did. When I rolled back to the previous kernel, I suddenly had sound again.
Debian 12 uses Pipewire only on Gnome as default. This fading exists on Pulseaudio as well as on Pipewire.
@g04tn4d0 do you happen to have a X570 mainboard?
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Oh, my! i have a B450 chipset.