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1b1ed1a
(Get the code!)
I can confirm this issue isn't fixed yet in recent 2.3.0 Beta of Mixxx.
I was curious about the quality of the built-in RIAA preamp in my Denon MC7000, so I did a quick test and connected a turntable directly to it. In Mixxx I selected the Denon device as AUX1 in settings, so I can do recordings also from the analogue inputs of the Denon MC7000.
It worked but with crackling sound in the recordings as described above. If I pick "Experimental" and raise the audio buffer to 92,9 ms, the recording seems quite OK.
I also did a second test and configured Pulseaudio as AUX1 input and played some music through Pulseaudio as loopback device. This worked flawlessly without any changes in my normal settings to buffer (5,8 ms) or Multi Soundcard Sync (Default (long delay)).
So this problem could probably be related to ALSA itself, but it's just a guess (tested with Gentoo Linux 64-bit, Kernel 5.4 with RT-Patch).
Regards,
Marco