I'm intending to capture the signal lines of an audio mixer (XLR, 16 channels).
Each channel can be a microphone (order of mV range), or line signal (upto around 1 V).
I want all lines (16 channels x 3 XLR (GND + 2 signal lines)) to either JST or pin headers (2.54mm).
I don't know in front which will be microphone/signal lines (or at least I don't like to be dependent on it).
When I will use Arduino ADCs or other ADCs, will I get problems (like crosstalk) of I try to read a signal of a few mV next to a signal of 1V? Is there a minimum space? Or is it best to put the GNDs in between like:
Pin 1 2 3 4 5 6 7 Ch1 Ch1 Ch1 Ch2 Ch2 Ch2 Ch3... Gnd pin2 pin3 Gnd pin2 pin3 …
So the minimum space between e.g. Ch1 pin2/3 which is 2 mV and Ch2 pin2/3 which is 1.0V is enough? (2 * 2.54 = 5.04mm) ?