ALSA upmix library missing

Hi and thank you for this project. I am trying to setup Dolby Pro Logic II encoding with the ALSA configuration from https://forum.kodi.tv/showthread.php…47689#pid847689. It uses "upmix" and the "dpl.conf" to squeeze the 5 speaker channels into just 2. Here is my current "~/.config/asound.conf" for testing:

<confdir:pcm/dpl.conf>

pcm.MyCard {
    type hw
    card 0
    device 0
}

pcm.mydpl {
    type plug
    slave.pcm {
        type upmix
        slave.pcm "dpl2:MyCard"
        channels 6
    }
}

When I now run speaker-test -c6 -Dplug:mydpl I get this error:

ALSA lib /build/build.LibreELEC-RPi2.arm-11.0.4/build/alsa-lib-1.2.8/src/dlmisc.c:337:(snd_dlobj_cache_get0) Cannot open shared library libasound_module_pcm_upmix.so (/usr/lib/alsa/libasound_module_pcm_upmix.so: cannot open shared object file: No such file or directory)

So to me it seems, not all alsa modules are being compiled

Thank you for the confirmation. Too bad, "just enough OS" is not enough for my purpose. I will give OSMC a shot and if that cannot do it either probably switch to raspbian.