Broken configuration for this PCM: no configurations available (chaining dsnoop and LADSPA)

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I have issues with the on-chip audio PHY of an Orange Pi Zero. This hardware seems to block the input stream if you record from it ("audio open error: Device or resource busy"). The canonical workaround for this appears to be dsnoop. Indeed, the following asound config allows for multiple simultaneous recorders:

pcm.dsnooped {
    type dsnoop
    ipc_key 321465
    slave {
        pcm "hw:0,0"
        channels 2

However, I also wish to use LADSPA to filter my input. Thus, I have to chain the aforementioned "dsnooped" block
to a filter block, which I implemented as follows:

pcm.filtered {
    type ladspa
    slave.pcm "dsnooped";
    path "/usr/lib/ladspa";
    plugins [{
        label highpass_iir
        input {
            controls [ 200 10 ]

Any attempt to record from this fails, however:

$ arecord -f dat -V stereo -Dplug:filtered test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo ALSA lib pcm_params.c:2226:(snd1_pcm_hw_refine_slave) Slave PCM not usable arecord: set_params:1310: Broken configuration for this PCM: no configurations available

The filter itself does, however, work: If I replace the slave line with

    slave.pcm "plughw:0,0";

then I get a proper recording, but once again I cannot record multiple streams simultaneously. I have some ideas why this may be but I am unsure and generally lost when it comes down to addressing this. Thus, any help is appreciated. This is not the first time I am fighting asoundrc, thus I would be particularly interested in how
to debug this, rather than what the solution is.

Software: Headless armbian buster with linux 5.10.34-sunxi and libasound2:armhf 1.1.8-1, no PA. here:

Best regards and thank you


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