This effect stretches the audio in real time according to the value of the automation. This can be used to add weird groove feeling to the loop.
The “grid” value changes the amount of steps in the main UI element.
“swing” control adds gradual time stretches on all 4 quarters. “noise” control adds random values (for 128 steps mode only)
“grain” knob changes grain size. “auto” button sets grain size according to the tempo and the selected grid. “gr env” changes the amount of envelope that changes the grain size.