Help to set up a simple sound card

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Hi,

I am on Gentoo Linux system.

I am trying to set up my soundcard so I can listen sound from multiple
application at once.

aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
pulse
    PulseAudio Sound Server
sysdefault:CARD=PCH
    HDA Intel PCH, ALC269VB Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC269VB Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=PCH,DEV=0
    HDA Intel PCH, HDMI 0
    HDMI Audio Output

aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I am running always Firefox web browser which uses pulseaudio:
"Since version 52, Firefox has made PulseAudio a hard requirement and
dropped support for direct output to ALSA. To enable sound in these
versions of Firefox enable the pulseaudio USE flag."

So when eg. I try to run this:
aplay -D hw:0,0 test.wav
I get this:
aplay: main:786: audio open error: Device or resource busy

How to solve this problem?

In this case what should I put into ~/.asoundrc to can listen sound
from multiple application at once?

-- 
Best, Pali

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