In view of the other responses, would you please elaborate ?
> Audio may be routed to GPIO 12/13 or GPIO 18/19.
Using RPI.gpio ?
> I guess if you route audio to GPIO 12/13
> it won't be available on the audio jack
That would be O.K.
> (which I think uses GPIO 18/19).
The signal should be on GPIO 18/19
' out of the box ' ? ..... I looked and couldn't
find it , but will try again .
What I want to do is experiment with
an alternate filter/driver for the output.
> It might be useful to look at info for adding audio out to Pi Zero
> as that routes PWM audio to pins on the gpio header and filters
> the signal to gate a usable line level analogue signal from it.
Anything applying to Pi Zero would work with 3 B + ........ ?
Same gpio ?
They talk of using alternate ' gpio ' modes ' ' , but I would
be more comfortable with Python , if possible.