Hi everyone,
I'm updating macOS from Mavericks to Catalina on an older build, experiencing the same audio popping/crackling issues from the onboard Realtek audio. There isn't a single program or action that causes this to happen, sometimes it calms down after a couple seconds into the media playing. Rapidly sliding the volume bar will also cause crackling.
Catalina 10.15.6. Multibeast 12.3.
Gigabyte Z87X-D3H, 4700K, 16 GB RAM, GTX760
HDMI Audio, other USB audio devices work just fine. I haven't experienced other weird USB or I/O issues. I disabled the Serial port and integrated GPU in the BIOS (updated firmware), and removed all other peripheral cards except the GPU. I also disconnected the chassis front panel audio.
In Multibeast, I tried both AppleALC and VoodooHDA v2.9.1. I adjusted the audio format, and I've tried other kext additions listed in other threads, but the popping still persists. Any ideas?