Since the pHAT DAC is based on a Hifiberry DAC, it does not support hardware mixing. Historically the work-around for this in ALSA is to define a dmix (direct mixing) plugin, an example of this can be found here.
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Since the pHAT DAC is based on a Hifiberry DAC, it does not support hardware mixing. Historically the work-around for this in ALSA is to define a dmix (direct mixing) plugin, an example of this can be found here.