Steinberg GROOVE AGENT 3 Mode D'emploi page 41

Shuffle
Musically, these two types are known as straight and swing based
music. And to make matters more complicated, music with a swing
can be based on either triplet 8ths (as in the song "New York, New
York") or triplet 16th notes (as in Stevie Wonder's "Sir Duke").
The Shuffle knob affects the sub-timing of the 8ths or 16ths and acts
a bit differently than the other Groove Agent controls. If you play a
straight style and turn the knob to the right (+), you'll hear the music
change to a more "swingy" style (the even 8ths or 16ths turning to
triplet feel). On the other hand, a swing based style becomes
straighter if you turn the dial to the left (–).
Unfortunately, while we've tried our best to provide a logical and "in-
destructible" user interface, the Shuffle knob can be used to mess
things up, too. If you turn it towards 7 o'clock when playing a straight
style, or if you turn it towards 5 o'clock when playing something triplet
based, the result will sound weird, to say the least. Use with intelli-
gence and an open mind!
The normal position for this knob is 12 o'clock. At this setting, all
styles sound as they were originally composed.
For that cajun, zydeco, or New Orleans kind of half-swing, try using a
straight style and move the Shuffle knob halfway to its triplet position, to
the 57–60% region.
Groove Agent 3
40 English
Some of the music in this world has a "straight" or
"even" subdivision. Eights are even eights, so to speak.
Other styles use some form of triplets, giving the rhythm
a certain "swing", a smoother, rolling character.