Quantize Notes dialog quantize all selected notes relative to bar line and beat positions. See more about this operation in Quantization topic.
The Quantize Notes dialog is brought up by selecting the menu item "Edit"->"Quantize...". The group of notes to quantize must be selected previously.
Quantization Step is measured in note duration units, ranging from half note to 32th. It determines the step for metrical grid used for quantization.
Quantize Onsets - if checked, quantization is applied to note onsets.
Quantize Ends - if checked, quantization is applied to note ends.
OK performs quantization, Cancel closes the dialog without any action, Help opens current help page.