Hello,

(see https://store.sure-electronics.com/product/AA-KA32473 )

FYI: working with standard USB audio mode, 

But since it claims to be a  "8 x 50W 6.1, 4.2, 4.0 Configurable USB Codec 
Input Audio Amplifier Board" the modes are not respected, which can be 
configured via switches on the Amplifier board.

ALSA Channels names (speaker-test):

     Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer 
- Side Left - Side Right

Input to KAB9 has differential Input feed by USB-AUDIO Interface with channel 
numbers: 

     IN1L+,IN1L-,IN1R+, ...,IN8R-

Signal are clean as differential signals (measured on speaker)

ALSA channel order stereo mode: 
   IN1 = 3, IN2=4, IN3=7, IN4=8, IN5=5, IN6=6, IN7=1, IN8=2 

ALSA channel numbers mono mode: 
   channel 1 = IN2 = 4,  channel 2 = IN4 = 8, channel 3 = IN6=6, channel 4 = 
IN8=2 

Questions:
- How to correct channel order ?
- How to switch between Mono und Stereo Mode on driver side maybe a module 
argument ?

Additionally on alsamixer there are all input parameter of the CM6206, but 
Card has only outputs...

Anyway thanks ALSA and USB Audio standard I can used it, but any hints how to 
make it more intuitively usable is appreciated.

mfG 
  Winfried

Addendum: here the Info for the test:

| Computer | Linux Debian system  |
|-|-|
|Notebook  | Debian 11 linux-5.10.0-20-rt-amd64 |
| embedded | | 
| USB-AUDIO | CM6206 chip - wondom module |
| amplifier | wondom KAB9 https://store.sure-electronics.com/product/AA-KA32473 
|

Boot-Messages

    [399312.935630] usb 6-2: new full-speed USB device number 11 using 
xhci_hcd
    [399313.100653] usb 6-2: New USB device found, idVendor=0d8c, 
idProduct=0102, bcdDevice= 0.10
    [399313.100661] usb 6-2: New USB device strings: Mfr=0, Product=2, 
SerialNumber=0
    [399313.100665] usb 6-2: Product: USB Sound Device        
    [399313.186887] usb 6-2: current rate 30464 is different from the runtime 
rate 96000
    [399313.232711] usb 6-2: Warning! Unlikely big volume range (=8065), cval-
>res is probably wrong.
    [399313.232717] usb 6-2: [9] FU [Mic Playback Volume] ch = 2, val = 
-6144/1921/1
    [399313.256834] usb 6-2: Warning! Unlikely big volume range (=8065), cval-
>res is probably wrong.
    [399313.256841] usb 6-2: [11] FU [Line Playback Volume] ch = 2, val = 
-6144/1921/1
    [399313.318887] usb 6-2: Warning! Unlikely big volume range (=6928), cval-
>res is probably wrong.
    [399313.318893] usb 6-2: [8] FU [Mic Capture Volume] ch = 2, val = 
-4096/2832/1
    [399313.342695] usb 6-2: Warning! Unlikely big volume range (=6928), cval-
>res is probably wrong.
    [399313.342701] usb 6-2: [15] FU [Line Capture Volume] ch = 2, val = 
-4096/2832/1
    [399313.366704] usb 6-2: Warning! Unlikely big volume range (=6928), cval-
>res is probably wrong.
    [399313.366710] usb 6-2: [2] FU [PCM Capture Volume] ch = 2, val = 
-4096/2832/1
    [399313.372016] input: USB Sound Device         as /devices/
pci0000:00/0000:00:08.1/0000:06:00.4/usb6/6-2/6-2:1.3/0003:0D8C:0102.0022/
input/input82
    [399313.431830] hid-generic 0003:0D8C:0102.0022: input,hidraw0: USB HID 
v1.00 Device [USB Sound Device        ] on usb-0000:06:00.4-2/input3

alsa device:

    Karte 3: ICUSBAUDIO7D [ICUSBAUDIO7D], Gerät 0: USB Audio [USB Audio]
    Sub-Geräte: 1/1
    Sub-Gerät #0: subdevice #0

alsa interfaces:

    hw:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        Direct hardware device without any conversions
    plughw:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        Hardware device with all software conversions
    sysdefault:CARD=ICUSBAUDIO7D
        ICUSBAUDIO7D, USB Audio
        Default Audio Device
    front:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        Front output / input
    surround21:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        2.1 Surround output to Front and Subwoofer speakers
    surround40:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        4.0 Surround output to Front and Rear speakers
    surround41:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        4.1 Surround output to Front, Rear and Subwoofer speakers
    surround50:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        5.0 Surround output to Front, Center and Rear speakers
    surround51:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        5.1 Surround output to Front, Center, Rear and Subwoofer speakers
    surround71:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
    iec958:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        IEC958 (S/PDIF) Digital Audio Output
    dmix:CARD=ICUSBAUDIO7D,DEV=0
        ICUSBAUDIO7D, USB Audio
        Direct sample mixing device
    usbstream:CARD=ICUSBAUDIO7D
        ICUSBAUDIO7D
        USB Stream Output






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