8

Glossary 435
LFO Abbreviation for Low Frequency Oscillator. An oscillator that delivers modulation
signals below the audio frequency range—in the bandwidth that falls between 0.1 and
20 Hz, and sometimes as high as 50 Hz or 400 Hz.
low cut filter A low cut filter is essentially a highpass filter that offers no slope or
resonance controls. It attenuates all frequencies below the defined cutoff.
lowpass filter The lowpass filter defines the maximum frequency that can pass
through without being affected, thus controlling the brightness of the sound. Every
signal above this frequency will be cut. The higher the cutoff frequency, the higher the
frequencies that can pass through. A lowpass filter that offers no slope or resonance
controls is a high cut filter.
main menu bar The bar at the top of the screen, offering global functions such as
opening, saving, exporting, or importing projects. It does not offer access to local
window functions.
master channel strip Channel strip in the Mixer that acts as a separate attenuator
stage, changing the gain of all output channel strips without affecting the level
relationships between them.
merge Mix, or combine, two or more MIDI events or regions into a single event or
region.
metadata Metadata is additional descriptive information that is stored in the file
header of a number of file types (AAF, for example). It is used to reference external
media, to simplify searches, and more.
metronome A device that produces a sound that taps out the beat. In Logic Express, it
can configured in the Metronome project settings.
MIDI Abbreviation for Musical Instrument Digital Interface. Standardized,
asynchronous, serial, event-oriented hardware and software interface for electronic
musical instruments. MIDI is an industry standard that allows devices such as
synthesizers and computers to communicate with each other. It controls the pitch,
length, and volume of a musical note event, among other characteristics.
MIDI channel A MIDI channel is a “tube” for MIDI data, which flows through MIDI ports.
Up to 16 separate MIDI channels can pass through a port simultaneously. Tracks
recorded in Logic Express can be directed to different tubes (channels), which can
contain different information, and play back through different sounds, assigned to each
channel. As examples, channel 1: piano, channel 2: bass, channel 3: strings and so on.
This presumes that the receiving devices are capable of receiving data on more than
one channel, and that they are capable of playing back different sounds simultaneously
(see multi timbral).