What does the "Quantize" function achieve in MIDI editing?

The "Quantize" function in MIDI editing is designed to adjust the timing of MIDI notes to align with a specific rhythmic grid, such as eighth notes or quarter notes. This process helps tighten the performance, ensuring that notes are played precisely on the beat or at defined intervals, which is essential for achieving a polished sound in music production.

When MIDI notes are quantized, their start times are moved to match the closest grid points set in the quantize settings. This is particularly useful for correcting timing inconsistencies in performances, allowing for a more rhythmic and cohesive piece.

In contrast, the other options focus on different aspects of MIDI editing. Changing the velocity of MIDI notes pertains to altering how hard a note is played, while transposing relates to shifting pitches up or down. Merging overlapping notes is about consolidating sounds rather than adjusting their timing.