I have a guitar amp that has a headphone output.
I would like to convert this signal to line level so I can use it in a small mixer along with other line level signals to be heard in "in ear" style headphones for a live monitoring setup.
How do I convert headphone level to line level?
(And line level in this case is assumed to be the "consumer" line level, aka "-10db" line level)
Also, I would need to convert the stereo output of the headphones into a mono signal in a reasonable way. I'm happy to just discard the right channel since the guitar amp is mono anyway, but I would be curious to see if there is a way to sum the outputs, for example, for the sake of learning, let's assume that left and right outputs are different signals here.
I'm guessing the solution is relatively simple, likely just a resistor or two.