Apple MB792Z/A User Manual - Page 1278

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 be 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 assumes 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). MIDI Clock Short MIDI message for clock signals. It is used to provide a timing pulse between MIDI devices. It is accurate to 24 ppqn (pulses per quarter note), although some devices interpolate these pulse values, resulting in a more precise clock signal if each device is capable of interpreting this additional information correctly. Also see SPP. MIDI message A message transmitted via MIDI that consists of one status byte and none, one, two, or many data bytes (with system exclusive commands). See event. MIDI Multi mode Multi-timbral operating mode on a MIDI sound module where different sounds can be controlled (polyphonically) on different MIDI channels. A multi mode sound module behaves like several polyphonic sound modules. General MIDI describes a 16-part multi mode (the ability to control 16 different parts individually). Most modern sound generators support multi mode. In Logic Express, multi mode sound modules are addressed via multi-instrument objects. This MIDI mode and multi mode sound modules are generally referred to as multi-timbral (see multi-timbral). MIDI region Data container for MIDI events, shown in the Arrange area as a named horizontal beam. MIDI Time Code (MTC) Translation of a SMPTE time code signal into a MIDI standard time code signal. MTC is used to synchronize Logic Express with MIDI devices, other sequencers, video and audio tape or hard disk machines that support MIDI Time Code. MTC determines absolute time positions and supports start, stop, and continue messages. 1278 Glossary