Metering
A display intended to indicate the level of a sound signal. It could indicate peak levels (eg. PPMs or digital sample meters), average levels (VU or RMS meters), or perceived loudness (LUFS meters).
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Mic Level
The nominal signal level generated by a microphone. Typically around -50dBu. Mic level signals must be amplified to raise them to line-level.
Microphone
A device used to convert an acoustic sound wave into an electrical signal.
Microprocessor
A specialised IC at the heart of a computer which performs calculations and other data manipulations, following software instructions.
Mid-range (mid, mids)
The middle portion of the audible frequency spectrum, typically denoting frequencies between about 300Hz and 3kHz.
MIDI Analyser
A device that gives a visual readout of MIDI activity when connected between two pieces of MIDI equipment.
MIDI Bank Change
A type of controller message used to select alternate banks of MIDI Programs where access to more than 128 programs is required.
MIDI Controller
A term used to describe the physical interface by means of which the musician plays the MIDI synthesizer or other sound generator. Examples of controllers are keyboards, drum pads, wind synths and so on.
MIDI Control Change
Also known as MIDI Controllers or Controller Data, these messages convey positional information relating to performance controls such as wheels, pedals, switches and other devices. This information can be used to control functions such as vibrato depth, brightness, portamento, effects levels, and many other parameters.
MIDI File
A standard file format for storing song data recorded on a MIDI sequencer in such a way as to allow it to be read by other makes or model of MIDI sequencer.
MIDI Implementation Chart
A chart, usually found in MIDI product manuals, which provides information as to which MIDI features are supported. Supported features are marked with a 0 while unsupported feature are marked with a X. Additional information may be provided, such as the exact form of the Bank Change message.
MIDI In
The socket used to receive information from a master controller or from the MIDI Thru socket of a slave unit.
MIDI Merge
A device or sequencer function that enables two or more streams of MIDI data to be combined.
MIDI Module
A sound generating device with no integral keyboard.
MIDI Multitimbral Module
A MIDI Sound Source capable of producing several different sounds at the same time and controlled on different MIDI channels.
MIDI Mode
MIDI information can be interpreted by the receiving MIDI instrument in a number of ways, the most common being polyphonically on a single MIDI channel (Poly-Omni Off mode). Omni mode enables a MIDI Instrument to play all incoming data regardless of channel.
MIDI Note Number
Every key on a MIDI keyboard has its own note number ranging from 0 to 127, where 60 represents middle C. Some systems use C3 as middle C while others use C4.
MIDI Note On
The MIDI message sent when note is played (key pressed).
MIDI Note Off
The Message sent when key is released.
MIDI Out
The MIDI connector used to send data from a master device to the MIDI In of a connected slave device.