DAC on the KC868-a6

[tanoshimi]

Note that it is rather confusing that the Kincony KC868-A6 labels the DAC outputs the wrong way around.
"DAC1" corresponds to GPIO26 (DAC2), whereas DAC2 corresponds to GPIO25(DAC1)

This has often led me to the think the DAC output isn't working, whereas it actually is, just on the wrong terminal.