I won't claim to know what the code is doing or supposed to do, just noticed a
warning that looks like a real error.
-Wduplicated-cond warns about a sequence of tests in
src/add-ons/kernel/drivers/audio/hda/hda_multi_audio.cpp. The set_mix function
contains something like:
if mix_control has flag B_MULTI_MIX_ENABLE
else if it has B_MULTI_MIX_GAIN
else if it has B_MIX_MUX_MIXER
else if it has B_MIX_MUX_SELECTOR
But B_MIX_MUX_SELECTOR and B_MULTI_MIX_ENABLE are the same values.
B_MIX_MUX_* are defined in an enum in hda_multi_audio.cpp itself. The B_MULTI_*
come from defines in headers/private/audio/hmulti_audio.h.
