Issue: select MIDI notes in an event. When clicking on Apply Quantize, some of these notes do not quantize to the nearest grid value which defeats this Quantize button purpose.
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Quantize function is non-destructive. It is based on the original event positions.
Reset Quantize
Reverts your audio or MIDI to its original, unquantized state, and resets any length changes that you performed in the Quantize Panel.
Freeze MIDI Quantize
Makes the start and end positions of MIDI events permanent. This function is useful in situations where you want to quantize a second time, based on the current quantized positions rather than the original positions.