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aux or auxiliary : An assignable, line-level input with no dedicated input source. Generally refers to an input connector in a preamplifier or integrated amplifier, signal processor, mixer, effects device, etc. The aux input has no de-emphasis or other special equalization and accepts line-level signals. Tone controls onf a preamp usually also affect signals sent to the aux input.

auxiliary : A bus allowing a signal to be sent from a mixing desk prior to the main output, usually to provide an input to effects. See effects send.

auxiliary envelope : An extra envelope in a synthesizer that, instead of being hard-wired to a filter or amplitude, is intended as a modulation source that can be applied to various destinations.

auxiliary messages : A classification of MIDI messages which includes Active Sensing, All Notes Off, Local On/Off, and Reset, and which describes whether the particular MIDI device responds to any of thsese messages.

AudioX : An open MIDI driver specification/standard being promoted by Cakewalk™.

APT x100 : See ISDN.

AMPEX : A former manufacturer of videotape recorders, analog audio tape recorders, and associated magnetic tape media. For the historic trivia fan, AMPEX is an acronym based on the founderís name, Alexander M. Poniatoff Excellence.

5-2-5 matrix : See Logic 7.

aux section : A smaller, independent mixer within the main mixing console which has an output consisting of a mix of everything going into the channels on which the appropriate effects send been turned up.

auxiliary send : Also called aux send. See effects send, insert point.

axis : In microphones, the direction of maximum sensitivity, generally perpendicular to the surface of the diaphragm or ribbon. In loudspeakers, the line projecting through the center of the voice coil toward the listening area. This is usually the direction in which the speaker exhibits the best overall frequency response. See acceptance angle, off-axis, directional microphone, polar pattern.

bass reflex enclosure : A type of loudspeaker enclosure with a hole, or port, in the surface on which the speakers are mounted, usually the front. Since this allows some of the energy from the rear of the speaker cones to project into the listening area, bass reflex systems have relatively high efficiency. Sometimes called a ported enclosure or a vented enclosure.

Betamax : A system used for color videotape recording, developed by Sony for consumer systems. Generally acknowledged to give higher picture quality than VHS.

BTX : A brand name of electronic devices that will maintain synchronization between two tape recorders, a tape recorder and a projector or video playback machine, etc. Used primarily to interlock one or more multitrack recorders to a video playback, for purposes of recording, overdubbing, or mixing music in sync with picture. The device uses SMPTE, time code, for electronic control of all machines.

bvox : See backing vocals.

channel assignment matrix : In a recording console, the group of buttons or switches by which the signal from any input channel can be assigned to one or more busses, and thereby be sent to one or more tracks of the multitrack recorder.

cue box : A wall-mounted or movable box that receives one or more monitor mixes from the recording console, and that has jacks to plug in several sets of headphones used to send the cue mix to singers or instrumentalists in overdubbing, a narrator, or other studio talent. Also called a headphone box. See cue system.

cue mix : The blend of live inputs and/or previously recorded tracks sent by the mixing engineer to the headphones of performers playing or singing in the studio. Also called the headphone mix.

EOX : End Of eXclusive. A System-Common MIDI message used as a flag in a MIDI datastream to indicate the end of a System-Exclusive message transmission.

exciter : A device for artificially enhancing a signal by adding new partials to it. These devices are said to compensate for loss of high frequencies in analog tape recordings. Also called an aural exciter.

expander : (1) A signal processing device which is the inverse of a compressor, providing the gradual attenuation of signals that fall below a user-defined threshold. This process, known as expansion, reduces background noise and at the same time increases the dynamic range of the input signal. (2) A synth, with out a keyboard or other master controller, often rack-mounted. Also called a tone module.

expansion : See expander(1).

expansion ratio : In an expander that is working below its threshold, the ratio given by the number of dBofdB change in input over the number of dBsofdBs change in output. Typical ratios are in the range 1:2 or even 1:20. Expansion ratio is the opposite and complement of compression ratio.

expression : One of the defined MIDI Controller Change messages, usually assignable to some parameter in a synthesizer, such as Volume or Filter Cut Off.

extension : Files used by Mac computer application programs to provide additional functionality to the computerís operating system. The equivalent of a DLL (Dynamic Link Library) file on a PC.

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