The Natural Philosopher  wrote:
> On 23/08/2019 13:24, A. Dumas wrote:
>> Mostly proprietary SoC, Broadcom ARM version with their VideoCore GPU. I
>> have no idea what's in there, but the Pi doesn't have hardware PWM or
>> analogue gpio pins.
>
> So its a 1 bit per channel software DAC

Yes. That's why I said "audio DAC chip" in an effort to be more precise.
Obviously there is always Digital to Analog Conversion but in the context
of computer audio output circuitry, how I think most people understand it,
the Pi does not have "a DAC".

Anyway, with that new driver the output seems to be entirely acceptable.

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