]]>You might be wondering why I chose this spot instead of directly to the jacks. And to answer this question, it's because there are output de-coupling caps on this board which will assure no dc-coupling issues with other gear.
You may be aware that ground connections in circuits aren't always universal. "Ground" lines can have have different functions and should remain independent (i.e. analog ground/digital ground). But that isn't the case here. In theory, you may have better results with the potentiometer's ground, as the ground points among the board are at slightly different potentials. With that said, I doubt you'll notice any difference between the two.
]]>]]>I want to prosound the existing jack in my DMG but I'm not sure where to take GND from. I want to wire pre-pot L and R to the solder points on the audio daughter board where the 4-wire cable leads, cutting that cable's L and R wires in the process. There is already a GND wire leading to the daughter board. In my logic that should be fine since all GND is ideally the same. I have seen some tutorials however, cutting that existing GND wire from the daughter board and rewiring the GND pin from the volume pot there.
Is that really necessary? Is it different for pre- vs post-pot? Is there a difference? Or do the people instructing me to re-wire GND to the existing jack work off other tutorials for a separate jack and didn't think far enough?
Thanks for any clarifying answers