When unselected, MIDI notes play to their individual end points, regardless of whether that exceeds the right region border.
Score: This function prevents the score display of particular regions, such as those that only contain MIDI events that can’t be displayed in the score. When set to Hide, the MIDI region is not displayed in the score.
Q-Velocity: When used with a groove template, this parameter (expressed as a percentage) determines the amount that the velocity values of quantized notes are affected by the velocity values of a template MIDI region. At a value of 0%, the notes retain their original velocity. At 100%, they adopt the velocity values of the template. Negative values alter the velocity, making the deviation from the template even greater.
Q-Length: When used with a groove template, this parameter (also expressed as a percentage value) determines how the lengths of quantized notes are affected by the equivalent note lengths (notes at the same position) of a template MIDI region. A value of 0% has no effect, while at 100%, the notes adopt the exact note lengths of the template region. Negative values alter note lengths further, resulting in a more significant deviation from the template.
Q-Flam: Notes with the same time position (chords) are spread out by this parameter. Positive values produce an ascending (upward) arpeggio; negative values a descending (downward) arpeggio. The position of the first note (either the bottom or top note, assuming all notes start at the same position) in the arpeggio is unaltered.
Q-Range: Defines which notes are quantized based on their proximity to quantization grid positions. At the default value of 0, every note is quantized. At positive Q-Range values, only notes outside the set range (that is, farther away from the grid position) are quantized, and notes in the range keep their original position. At negative Q-Range values, only notes in the set range are quantized, and notes outside the range remain unchanged. The amount by which notes shift toward the grid positions depends on the Q-Strength setting.
For example, with Q-Range set to 20 ticks and Q-Strength to 50%, only notes that are more than 20 ticks off are quantized. Those notes are quantized by 50%, which improves the timing without making the performance sound mechanical.
Q-Strength: This percentage value determines how far a note is shifted toward the nearest grid position. 100% results in full quantization; 0% leaves the note at its recorded position.
You can apply the MIDI region parameter settings of all selected MIDI regions and folders with the Functions > MIDI Region Parameters > Apply All Parameters Permanently command.
This means that all settings are actually written as data, and playback parameters revert to normal values. The audible result remains the same. The Loop parameter and advanced quantization parameters (Q-Velocity, Q-Length, Q-Flam, Q-Range, and Q-Strength) aren’t affected. However, use this carefully as you lose the ability to change your mind about MIDI region edits.
Like the Merge function and the Join tool, the Apply All Parameters Permanently function intelligently handles stored MIDI channel numbers. If all stored events have the same MIDI channel number, the channel is changed to that of the instrument assigned to the current track. If the events are on different channels, Logic Pro asks whether you want to convert the event channels.
The following options are also available in the Functions > MIDI Region Parameters menu:
Apply All except Channel: Leaves the stored channel number untouched.
Apply All except Channel & Delay: Leaves the stored channel number and Delay parameters untouched.
If the playback instrument has a channel setting of All, or if you’re dealing with a completely different type of Environment object (a channel splitter used as A-Playback, for example), the stored MIDI channel numbers are also unaffected by the usual Apply All Parameters Permanently function.
Note: If you’re editing MIDI regions that appear as notation on a polyphonic staff style, you should use use the Apply All except Channel function, as the event channel is used to assign notes to individual polyphonic voices in the Score Editor.
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Logic Pro User Guide: PDF