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@lxo I assumed SOF contained more than just the source-code for the firmware here, but that may be incorrect. What you write seems consistent with the documentation I'm reading. The "source code" for the ALSA topology is also interesting, as it is compiled into a binary /lib/firmware/ blob. There is source code for it, but it is so hardware-specific and magical that I wonder if it would qualify as the preferred form of making modifications to. https://github.com/alsa-project/alsa-topology-conf/blob/master/topology/hda-dsp/skl_hda_dsp_generic-tplg.conf