So for me, this is once again a case of "At analog audio frequencies, you pretty much don't have anything to worry about." I've heard of rare cases where telephone calls were accidentally coupled onto adjacent lines, but this was in the Transatlantic trunk.
A plane does not necessarily create crosstalk into a trace. A large plane near a trace will form a current loop with the trace. You can create crosstalk into another current loop. This is because crosstalk is mediated by the electromagnetic field.
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