For “quantize ends” the manual says:
RESULT The ends of the MIDI events are moved to the nearest grid positions.
For “quantize lengths” the manual says
RESULT The ends of the selected MIDI events are cut off so that the events match the length quantize value. The start positions are kept.
However, when I uses these two different quantize settings they appear to do exactly the same thing. Quantize lengths does not “cut off” events only it also lengthens events so that the length coincides with a grid position. Neither setting appears to move the beginning of the note. Can someone please explain the difference?
Ok I think I figured it out… It appears that Quantize lengths makes a midi event a certain length (according to what the quantize L is in the key editor) and lengthens or shortens an event to be that value. It does not quantize the end of the note to the grid unless the start of the note is also quantized. In retrospect, the different quantize values do exactly what they say. The reason why I was not seeing the difference is because my start event was quantized to the grid so it appeared that both settings did the same thing. Tricky one!
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That is correct.
Quantize Length will quantize the duration of a note, the end position of a note will be decided by its start position and the quantize value.
Quantize Ends will make sure that the NoteOff is on the grid, the start position does not play a role.