Hi Ronnie,
I’ve just been giving myself a severe kicking after realising what the
problem was. In an earlier hardware arrangement I used GPIO21 to turn a
backlight off and hadn’t bothered to disable it. Of all the pins I could
have chosen GPIO21 is used by I2S so explains why the DAC didn’t work.
Many thanks for your assistance, you obviously inspired me to look
closer.
Best wishes for 2020
Keith

Keithfuller wrote: 
> Hi Ronnie and thanks for your welcome.
> Yes I’ve been in beta mode. I’ll certainly be kicking myself if that
> turns out to be the problem.
> Cheers, Keith


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