Alsa special use case scenario - config of asound.conf

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Hello everybody,

after two nights of reading, trying I give up.

My setting is a ESI Maya44 USB+ Audio interface, attached to a Raspberry
Pi...

The Audio Interface has 4 mono inputs and 4 mono outputs

Basic sound works good, onboard sound chip is disabled by module
blacklisting.

The goal to achieve is mixing all four mono inputs together and route
them simultaneous to atleast two of the outputs.

I dont have a clue wether this can be done with pure Alsa or if this
needs Jack...to be honest, i dont have a clue of the
asound.conf/.asoundrc at all. Trial and error didnt make it aswell, as
there is no error reporting of Alsa if anything is wrong.

But maybe there is somebody who can help/give some hints...


Thanks in advance!


Manuel


PS: attached are the outputs of:

aplay -l :

**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 1: USB [MAYA44 USB+], Gerät 0: USB Audio [USB Audio]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0

-----

aplay -L :

null
    Discard all samples (playback) or generate zero samples (capture)
jack
    JACK Audio Connection Kit
pulse
    PulseAudio Sound Server
output
default:CARD=USB
    MAYA44 USB+, USB Audio
    Default Audio Device
sysdefault:CARD=USB
    MAYA44 USB+, USB Audio
    Default Audio Device
front:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    Front speakers
surround21:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    Direct sample mixing device
dsnoop:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    Direct sample snooping device
hw:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    Direct hardware device without any conversions
plughw:CARD=USB,DEV=0
    MAYA44 USB+, USB Audio
    Hardware device with all software conversions
usbstream:CARD=USB
    MAYA44 USB+
    USB Stream Output

----

cat /proc/asound/card1/usbmixer :

USB Mixer: usb_id=0x25730008, ctrlif=0, ctlerr=0
Card: ESI Audiotechnik GmbH MAYA44 USB+ at usb-3f980000.usb-1.5, full speed
  Unit: 2
    Control: name="Line Playback Volume", index=1
    Info: id=2, control=2, cmask=0x3, channels=2, type="S16"
    Volume: min=0, max=255, dBmin=0, dBmax=99
  Unit: 2
    Control: name="Line Playback Switch", index=1
    Info: id=2, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 4
    Control: name="Line Playback Volume", index=0
    Info: id=4, control=2, cmask=0x3, channels=2, type="S16"
    Volume: min=0, max=255, dBmin=0, dBmax=99
  Unit: 4
    Control: name="Line Playback Switch", index=0
    Info: id=4, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 7
    Control: name="Master Playback Volume", index=0
    Info: id=7, control=2, cmask=0x3, channels=2, type="S16"
    Volume: min=0, max=255, dBmin=0, dBmax=99
  Unit: 7
    Control: name="Master Playback Switch", index=0
    Info: id=7, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 10
    Control: name="Line Capture Volume", index=0
    Info: id=10, control=2, cmask=0x3, channels=2, type="S16"
    Volume: min=0, max=255, dBmin=0, dBmax=99
  Unit: 10
    Control: name="Line Capture Switch", index=0
    Info: id=10, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0



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