Playback and Recording : MIDI Recording : Input Quantize

Input Quantize
When Input Quantize is enabled in the Input Quantize Event Operations dialog (Event > Event Operations > Input Quantize), all recorded MIDI notes are quantized automatically. Quantizing MIDI on input is useful for achieving rhythmically precise MIDI recordings. However, to preserve all of the original nuance of your recorded MIDI tracks (such as rubato phrasing), disable this option.