See 'Mix-minus'

A 'Mix-minus' is, as the term implies, a full programme mix but with one contributing source missing from the mix. Most commonly used in broadcast applications, the mix-minus feed is used as the return (foldback) monitoring signal to a remote contributor. The idea is that the remote contributor needs to hear contributions from all other sources being mixed into the programme, but must not receive their own contribution coming back as that could result in howlrounds and confusion due to transmission delays. In programmes involving multiple remote contributors, each would need to receive its own independently generated Mix-Minus signal.

A Mix-Minus signal can be generated in several different ways, but this term normally refers specifically to a technique whereby the remote contributor is sent the full programme mix with a second version of the remote contributor's signal added in opposite polarity, thus cancelling out the remote contribution. Another technique is to use the equivalent of an Aux bus which receives contributions from every source except the remote contributor. This approach is normally described as 'N-1' or 'Clean-feed' — but the results are exactly the same.

To save data to a digital storage medium, such as a hard drive.

The parameter of tape head alignment related to the rotation angle of the head in a vertical axis which determines how the tape arrives and leaves the head gap. (cf. Azimuth and Zenith)

A cyclical variation in replay speed which affects the pitch of the recorded material. Wow is a low-speed variation (nominally below 4Hz) which typically occurs once per revolution of the device and may be caused by an off-centre hole on a vinyl record, or a sticking tape on a reel-reel machine. Flutter is a higher speed variation (nomninally above 4Hz) and can often be perceived as a form of intermodulation distortion.

The precise timing of digital audio samples is critical to the correct operation of interconnected digital audio equipment. The 'metronome' that governs sample timing is called the Word Clock (sometimes conjoined to 'Wordclock', or abbreviated to 'Wclk'). However, word clock does more than merely beat time; it also identifies the start and end of each digital word or sample, and which samples belong to the left or right channels. Digital interfaces such as the AES3 and S/PDIF embody clock signals within the data stream, but it is often necessary to convey a discrete word clock between equipment as a square wave signal running at the sampling rate. Dedicated word clock inputs and outputs on digital equipment generally use BNC connectors.