What is an insert?

The term “insert” comes from the analog audio world, and refers to a physical point in the audio signal chain where a “detour” in the signal chain can be “inserted”, usually by means of a TRS (tip-ring-sleeve) jack and a “Y” cable. It is typically used to “insert” effects into the signal chain.

Pro Tools uses this concept of “inserts”, both for plugin functionality, and hardware effects.