Apple Logic Express 9 - Manual (Page 1261)

AAC Abbreviation for Advanced Audio Codec. A compression and decompression algorithm
and file format for audio data.
AAF Abbreviation for Advanced Authoring Format. A cross-platform project exchange file
format that you can use to import multiple audio tracks, inclusive of references to tracks,
time positions, and volume automation.
accelerando A gradual increase in tempo (see tempo).
AD converter or ADC Short for analog-to-digital converter; a device that converts an
analog signal to a digital signal.
ADAT Abbreviation for Alesis Digital Audio Tape. The ADAT is an eight track digital
multitrack cassette recorder that uses an S-VHS video tape to record audio at 16 or 20 bit
depth.
ADAT optical Optical interface for parallel transmission of eight audio channels via
fiber-optic cable. It is a well-established standard for digital multi-channel interfaces.
AES/EBU Short for Audio Engineering Society/European Broadcasting Union. This association
has a standard transmission format for professional stereo digital audio signals called
AES/EBU. The format is similar to S/P-DIF, but uses balanced line drivers at a higher voltage.
Depending on the type of devices involved, AES/EBU and S/P-DIF coaxial interfaces can
communicate directly.
aftertouch MIDI data-type generated by pressure on keys after they have been struck.
There are two types: Channel aftertouch, the value of which is measured by a full length
keyboard sensor. It affects all played notes. Polyphonic aftertouch (rare) is individually
measured and transmitted for each key. Aftertouch is also known as key pressure or
pressure sensitivity.
AIFF Abbreviation for Audio Interchange File Format. A cross-platform file format supported
by a large number of digital audio and video editing applications. AIFF audio can use a
variety of bit depths, most commonly 16 and 24 bit.
AKAI Common sample data format that the EXS24 mkII is compatible with.
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