The technical aspect of crosstalk
Crosstalk is a channel separation malfunction.
I’ll try my best to explain.
So you’re on a phone, in the beginnings of telephony, and parallel to your signal is a second signal from a entirely different conversation, inside of the telephone circuit.
Then in an electromagnetic way the strangers signal would feed into yours, if the signals are not properly insulated.
It would blend in. Therefore you’d hear some random dialogue, hence the name crosstalk.
In Tape, due to a lack of channel separation, the left signal would feed into the right signal and reverse.
That’s the reason for this monoing effect.
I hope it made sense!
Please excuse any errors. I’m not an native english speaker.