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Note Lag adds a small delay before each note is played by a MIDI Voice Setup. If all voices have Note Lag set to zero, every note will be "on the beat". Note Lag allows voices to be slightly desynchronized, more like a group of real human musicians and less "machine"-like.
For even more realism, you can vary the Note Lag during the performance using a Changes script.
The delay time is the Note Lag value multiplied by the Trace Update interval, which is typically 10 msec. A Note Lag of 1 would thus give a delay of 10 msec, which is just noticeable. The maximum Note Lag value of 15 would give a delay of 150 msec, which would be very noticeable.
In general, the total delay should be kept under the Tempo msec value to avoid interference between beats.
Note Lag can only delay notes. However, you can use it to get voices that are ahead of the beat. Consider that in most cases, there is no absolute reference to determine what is "on the beat" and what is early or late... everything is relative. So, you simply add a fixed Lag to all the other voices (as well as Percussion Lag for any active Percussion Instruments), and define that time as "the beat". Any voice that has less Lag will be ahead; any with more will be behind.
Use gv=n to set Note Lag for Voice v to the value of n, which may be any unsigned integer or valid expression, including current MIDI control values, random values, current computer keyboard states or mouse position, input or buffered notes, or oscillators. The value will be limited to a range of 0 to 15.
For example, g2=4 sets Note Lag for Voice 2 to a value of 4, which would give a 40 msec lag with the default 10 msec Trace Update interval.
You can use "voice" 9 to set Note Lag for all 8 voices at once.
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