A former engineer (who was eventually banned from the facilities for various people problems including throwing a chair at a DJ) had made dozens of these splices where almost anything that’s an analog stereo pair goes into an electrical tape covered Y connection into some kind of 4-wire shielded cable.

Out of curiosity I unwrapped the tape from one of his splices to see what was inside.

Oh, no. No no no no no no my entire facility is wired like this no no no no NOPE FUCK AAAAAAAAAHHHHHHHNOPENOPENOPEARONIWITHCHEESENONONONO