Insert (effects processing)
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In effects processing and sound reinforcement, an insert is a tip-ring-sleeve connector on the back of a sound board, used for creating a loop through an effects processor. When the plug is inserted into the jack, an internal switch reroutes the incoming signal out to the external device. Generally, the tip is "send" (mnemonic: transmit), and the ring is "return" (relative to the board), but some are reversed. Because the components are generally a short distance apart, there is no need for a balanced line, thus the insert is used as two unbalanced lines for the sake of single-connection convenience.
Inserts are often provided on each input of a board, and on sub-masters. One common usage is for audio level compression of microphones, or for other voice effects like reverb. Insert jacks on some consoles (including Mackie boards) are also designed to send-only if a plug is partly inserted, which is useful for splitting inputs out for multi-track recording.
Inserts can be used for any type of signal, though audio is most common.
