Hi,
actually the pulseaudio sound server does use the ALSA driver to get
access to the audio interface. If pulseaudio has already grabbed the
audio interface via the ALSA driver, you first need to disable
pulseaudio, before other software can access the hardware
by the ALSA driver.
I can't help you with disabling pulseaudio on demand or how to use
other workarounds, since I either use ALSA directly or the jack sound
server. On my machine pulseaudio isn't installed at all.
The software you want to use seemingly supports jack:
[rocketmouse@archlinux ~]$ pacman -Si mixxx | grep s\ On
Depends On : chromaprint faad2 gperftools glu libid3tag libmad
libmp4v2 libshout lilv opusfile portaudio portmidi protobuf qt5-script
qt5-svg qt5-x11extras rubberband taglib upower wavpack
[rocketmouse@archlinux ~]$ pacman -Si portaudio | grep s\ On
Depends On : gcc-libs jack
Regards,
Ralf
--
pacman -Q linux{,-rt{-cornflower,-pussytoes,,-securityink}}|cut -d\ -f2
5.2.4.arch1-1
5.2_rt1-0
5.0.21_rt16-1
5.0.19_rt11-1
4.19.59_rt24-0
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