All the audio mixer circuit examples I see online are based off of the summing amplifier:
This is an inverting op amp configuration so the output is inverted. I built a similar circuit and I couldn't tell that the output signal was inverted by listening to the audio...so is there a reason why you would want to de-invert the output of the mixer, by putting in another inverting op amp stage at the output, like in this circuit:
If the audio output sounds the same whether the output signal is inverted or not, why would you ever need to de-invert the output?
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