[Joke] What to do when the invalid sample rate is reached when using Mixxx on Ubuntu 20.04

environment

Event that occurred

--It works fine as a USB midi device, but there is no sound from the headphone jack of MixTrack Pro 2. --No sound from applications other than Mixxx from the headphone jack of MixTrack Pro2 --Invalid sample rate error occurs when trying to output sound from the headphone jack of MixTrack Pro 2 in the sound device settings.

Error opening "MixTrack Pro 2: USB Audio (hw:1,0)"
Invalid sample rate

What I tried

--Check if lsusb recognizes MixTrack Pro2 --If snd-usb-audio is not loaded by lsmod, load it manually ([Source so far](https://www.linuxquestions.org/questions/linux-hardware-18/usb-soundcard-numark-] mixtrack-pro-2-does-not-work-4175612190 /)) --Start mixxx after changing the environment variable to use plughw without using HW of ALSA (Source)

$ sudo modprobe snd-usb-audio
$ export PA_ALSA_PLUGHW=1
$ pasuspeder mixxx  #pasuspender temporarily stops PulseAudio while Mixxx is running

Persistence

--Add `snd-usb-audio``` to / etc / modules and load kernel modules at boot time --Added alias mixxx ='export PA_ALSA_PLUGHW = 1 && pasuspender mixxx' `` to ~ / .bashrc --Changed the "Exec =" line in ~ / .local / share / applications / mixxx.desktop to ``` sh -c'export PA_ALSA_PLUGHW = 1 && pasuspender mixxx'

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