[sdiy] Mixing PWM audio from 2 different devices. Ouch!

[Benjamin Tremblay]

Okay, one more question. 
How do I isolate the analog ground from the digital ground? Does that mean they do not connect at all?
If so, do I make a “virtual” ground with a (not-too-high impedance) voltage divider and attach the audio jack’s ground to this? 

I never really have understood the practice. I see a voltage divider pseudo-ground used in the Teensy Audio Shield.

Thanks,
Benjamin
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