Установка и настройка EAX в среде LINUX

$ sudo apt-get install linux-sound-base alsa-base alsa-utils
$ sudo apt install linux-modules-extra-$(uname -r)

$ sudo dnf install linux-sound-base alsa-base alsa-utils

$ modinfo snd-aloop
filename:       /lib/modules/5.11.22-100.fc32.x86_64/kernel/sound/drivers/snd-aloop.ko.xz
license:        GPL
description:    A loopback soundcard
author:         Jaroslav Kysela <[email protected]>
depends:        snd,snd-pcm,snd-timer
retpoline:      Y
intree:         Y
name:           snd_aloop
vermagic:       5.11.22-100.fc32.x86_64 SMP mod_unload 
sig_id:         PKCS#7
signer:         Fedora kernel signing key
sig_key:        5B:27:E3:B7:61:D2:FB:F5:2C:B1:EF:06:ED:31:9A:25:06:A9:3F:7F
sig_hashalgo:   sha256
signature:      98:A0:4C:89:1B:E2:6B:FF:14:1F:18:AE:83:22:61:3D:F1:21:11:2D:
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parm:           index:Index value for loopback soundcard. (array of int)
parm:           id:ID string for loopback soundcard. (array of charp)
parm:           enable:Enable this loopback soundcard. (array of bool)
parm:           pcm_substreams:PCM substreams # (1-8) for loopback driver. (array of int)
parm:           pcm_notify:Break capture when PCM format/rate/channels changes. (array of int)
parm:           timer_source:Sound card name or number and device/subdevice number of timer to be used. Empty string for jiffies timer [default]. (array of charp)

$ touch /etc/modprobe.d/alsa.conf
$ vi /etc/modprobe.d/alsa.conf

#
# /etc/modprobe.d/alsa.conf
#
alias snd-card-0 snd-aloop
options snd-aloop enable=1,1  index=10,11  pcm_substreams=2,2
#
:wq

$ touch /etc/modules-load.d/snd-aloop.conf
$ vi /etc/modules-load.d/snd-aloop.conf

snd-aloop
:wq

$ touch ~/.asoundrc
$ vi ~/.asoundrc

pcm.!default {
    type hw
    card 0
}

ctl.!default {
    type hw
    card 0
}

pcm.ERMAK_OUT {
    type plug
   slave {
      pcm "hw:10,0,0"
      format S16_LE
      rate 48000
      channels 2
    }

    hint {
      show on
      description "Ermak EAX VAC RX"
    }
}

pcm.ERMAK_OUT_RESERVED {
    type plug
    slave {
        pcm "hw:10,1,0"
        format S16_LE
        rate 48000
        channels 2
    }
    hint {
      show on
      description "Ermak EAX VAC TX"
    }
}

pcm.ERMAK_IN {
    type plug
   slave {
      pcm "hw:11,1,0"
      format S16_LE
      rate 48000
      channels 1
    }

    hint {
      show on
      description "Ermak EAX VAC RX 1"
    }
}

pcm.ERMAK_IN_RESERVED {
    type plug
    slave {
        pcm "hw:11,0,0"
        format S16_LE
        rate 48000;
        channels 1
    }
    hint {
      show on
      description "Ermak EAX VAC TX 1"
    }
}

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Device [USB Audio Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sofhdadsp [sof-hda-dsp], device 0: HDA Analog (*) []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: sofhdadsp [sof-hda-dsp], device 1: HDA Digital (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sofhdadsp [sof-hda-dsp], device 3: HDMI1 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sofhdadsp [sof-hda-dsp], device 4: HDMI2 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sofhdadsp [sof-hda-dsp], device 5: HDMI3 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 10: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 10: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 1/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 11: Loopback_1 [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 11: Loopback_1 [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 1/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1