MIDI Splitter
An alternative term for MIDI Thru box.
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MIDI Sync
A description of the synchronisation systems available to MIDI users - MIDI Clock and MIDI Time Code (MTC).
MIDI Thru
The socket on a slave unit used to feed the MIDI In socket of the next unit in line.
MIDI Thru Box
A device which splits the MIDI Out signal of a master instrument or sequencer to avoid daisy chaining. Powered circuitry is used to 'buffer' the outputs so as to prevent problems when many pieces of equipment are driven from a single MIDI output.
Mineral Wool
Made from natural or synthetic minerals in the form of threads or fibres tangled together to form a moderately dense ‘blanket’ which permits but impedes air flow and is useful in the creation of sound absorbers, often employed as a cheaper and more efficient alternative to polyurethane form.
Mirror Points
The positions on the walls or ceiling where, if the surface was covered with an optical mirror, one or both loudspeakers could be seen in the reflection. The mirror point is essentially any position on a boundary where sound waves from a sound source - usually a monitor loudspeaker - will be reflected directly to the listening position. This is therefore the ideal location to place an acoustic absorber to prevent audible reflections.
Mixer
A device used to combine multiple audio signals together, usually under the control of an operator using faders to balance levels. Most mixers also incorporate facilities for equalisation, signal routing to multiple outputs, and monitoring facilities. Large mixers are also known as ‘desks’ or ‘consoles’.
Modal Distribution
The characteristic distribution of resonant low frequency sound waves within a confined space such as a room.
Modelling
A process of analysing a system and using a different technology to replicate its critical, desired characteristics. For example, a popular but rare vintage signal processor such as an equaliser can be analysed and its properties modelled by digital algorithms to allow its emulation within the digital domain.
Monitor (also Loudspeaker )
A device used to convert an electrical audio signal into an acoustic sound wave. An accurate loudspeaker intended for critical sound auditioning purposes. Also used to refer to a computer display screen (VDU), or the act of auditioning a mix or a specific audio signal.
Monitor Controller
A line-level audio signal control device used to select and condition input signals for auditioning on one or more sets of monitor loudspeakers. Some monitor controllers also incorporate facilities for studio talkback and artist cue mixes.
Mono
A single channel of audio.
Monophonic
One note at a time.
Monosynth
A synthesizer that can play only one note at a time (see also Polysynth and Paraphonic)
Motherboard
The main circuit board within a computer into which all the other components plug or connect.
Moving Coil Microphone
A dynamic microphone where the diaphragm supports a coil of wire which moves within a magnetic field. When sound causes the diaphragm to vibrate a small electrical current is generated within the coil. The same technology is used in reverse for a moving coil loudspeaker, in which a powerful current is passed through the coil, causing the diaphragm (cone) to move in response.
M-S (Mid-Side)
– A specialist form of coincident microphone array which, when decoded to left-right stereo, creates an equivalent XY configuration. In the MS array one microphone is pointed directly forward (Mid) while the second is arranged at 90 degrees to point sideways (Side). The Mid microphone can employ any desired polar pattern, the choice strongly influencing the decoded stereo acceptance angle. The Side microphone must have a figure-eight response and be aligned such that the lobe with the same polarity as the Mid microphone faces towards the left of the sound stage. Adjusting the relative sensitivity of the Mid and Side microphones affects the decoded stereo acceptance angle and the polar patterns of the equivalent XY microphones.
MTC (MIDI Time Code)
A format used for transmitting synchronisation instructions between electronic devices within the MIDI protocol.
Mult
An abbreviation of 'multiple output' (also known as a 'parallel-strip' in BBC parlance). Refers to a line-level signal splitting or distribution facility typically found on patchbays in which three or more sockets are wired together to allow an input signal to be shared with multiple destinations. As an entirely passive facility the operation relies on a very low source impedance and high destination (bridging) impedances to minimise the loss of signal level. Microphone 'mults' tend either to use transformers with multiple secondary windings or active buffer or distribution circuitry.