A function of an electronic keyboard, that allows the use of the keyboard and the sound generating section to be used independently of each other. Using a MIDI router, it is possible to control the sounds of remote devices without triggering additional sounds from the sound source of the triggering synthesizer.
(See MIDI)

Low Pass Filter (LPF)
A filter that attenuates frequencies above a certain cutoff point, while passing on frequencies below the cutoff unaffected. Sometimes referred to as high-cut filter.

A loosely defined audio term used to describe devices whose input or output impedance is less than approximately 5,000 Ohms. For microphones, Lo-Z commonly is 50 - 1,000 Ohms.

MOTU Audio System is a plugin engine developed by Mark of the Unicorn for use in its software. Plug-in engines developed by competing manufacturers do not support MAS. However, by using an extension called VST Wrapper, Performer is able to utilize VST plugins.

Modular Digital Multitrack. A digital recorder that can be used in conjunction with other similar format machines to provide a greater number of tracks than a single machine.

The MOSFET is a particular type of Field-Effect Transistor (FET) where the output current flowing between the source and drain terminals is controlled by a variable electric field applied to the gate terminal. The gate design determines the type of FET. In the MOSFET, the gate is insulated from the channel by a very thin (typically less than the wavelength of light) layer of glass.

Often refers to the middle part of the audio frequency spectrum, as perceived by humans. For example, a midrange driver would be a speaker that was optimized for that particular range.

A format introduced several years ago by Sony that allows recording and playback of audio to and from a small magneto optical disc with a capacity of 140MB. To be able to record 74 minutes of music, the technology applies a data compression algorithm called ATRAC that compresses the data by about 5:1, but also permanently changes the file on decompression.

A miniature phone plug, available in both mono and stereo versions. The most common size for audio use is 3.5 mm (1/8".)

A Switchcraft Tini-QG connector, frequently called a mini-XLR, is available in several configurations. The connector is often used on small boundary microphones, and for the microphone connections on some wireless body-pack transmitters. The pins are numbered in the opposite direction from a standard XLR but the wiring scheme is not standardized within the microphone industry.