Modern Mixing consoles use "Insert" jacks that allow you to break into the signal path to add an outboard signal processor (reverbs, delays, compressors, etc.) using just one cable, which connects to both the input and output of that device.
Send Return (also known as a Insert Cable), conventionally wired: TIP = Send, RING = Return. Can be used as a "Y" to split stereo signal into Left and Right. In this case, Right = RING and Left = TIP.
STEREO ¼" (TIP-RING-SLEEVE) PHONE — TWO ¼" PHONE, 3m (9.9ft.)
Stereo 1/4 Phone - Two 1/4 Phone, 3 m (9.9ft.)
