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Entries found for search: velocity

release velocity : The speed with which a controller key is raised or otherwise released, and the type of MIDI data used to encode that speed. Release velocity sensing is rare but found on some instruments. It is usually used as a rate control for the release segment of the sound envelope.

velocity : (1) A type of MIDI data (range 1 to 127) usually used to indicate how quickly a key was pushed down (attack velocity) or allowed to rise (release velocity). A Note-On message with a velocity value of 0 is equivalent to a Note-Off message. (2) The velocity of sound: The speed at which sound waves propagate. The precise speed will depend on the density of the medium through which the sound waves travel: in air, at sea level and at 0˚C with 30% relative humidity, this is approximately 1088 ft/sec. (331.7 m/sec.) At average room temperatures it is slightly faster.

velocity compression : Each MIDI Note-On message has a velocity value between 1-127. The velocity corresponds to how hard the key was struck. In velocity scaling, (more accurately called a velocity offset), a group of notes is selected for editing and then their velocities are all cut or boosted in a linear manner: e.g., with a scaling value of -20, three notes originally recorded with velocities of 65, 91, and 37 would be set to play back with velocities of 45, 71, and 17, respectively. In velocity compression (sometimes called velocity scaling), the velocities are multiplied or divided by some factor so that the differences between them get larger or smaller. With a compression value of 75%, for example, the same three notes would be played back with velocities of 49, 68, and 28. This means that the note with the largest starting velocity is reduced the most, while soft notes play back closer to their original velocity, helping to keep them audible. Thus, compression is a better way to smooth out the transients in a passage that were played too loudly, without changing the musical dynamics of the piece.

velocity crossfade : The blending of multiple samples in varying proportions depending on key velocity. Sounds on samplers that are often programmed to use velocity crossfades include pianos and other tuned percussion instruments whose timbre changes character markedly depending on how hard a note is played.

velocity curve : A map that translates incoming velocity values into other velocities in order to alter the feel or response of a keyboard or tone module. Some devices have a preset range of velocity curves, and some allow users to program their own.

velocity offset : See velocity compression.

velocity of sound : See velocity(2)In air, sound travels at about 1,087 feet per second at 32˚F and 30% relative humidity. This velocity changes by about one foot per second, increasing as temperature goes down and decreasing as temperature goes up.

velocity scaling : See velocity compression.

velocity sensitivity : A type of touch sensitivity in which the keyboard measures how fast each key is descending. Compare with pressure sensitivity.

velocity switching : See cross-switching.

Air pressure or Velocity Mic converts sound waves traveling in air into an audio signal traveling in the mic cable.

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