Editing MIDI: Quantizing, Velocity, and Transposition

The Piano Roll is great for fixing individual notes. This lesson covers the tools that act on an entire performance at once — much faster when the whole region needs the same kind of adjustment.

Quantizing timing

Quantize snaps every note in a region to the nearest beat or subdivision you choose (quarter notes, eighth notes, sixteenth notes, and so on). Select a region, open its quantize setting in the region's info or Smart Controls, and pick a grid value. Tighter grids (smaller subdivisions) make small adjustments; looser grids can noticeably reshape a sloppy performance.

A word of caution: quantizing too aggressively — especially on anything meant to feel human, like a bassline or a strummed guitar part — can flatten out the natural feel that made it sound good in the first place. Try a lighter setting before jumping to the tightest grid available, and use your ears, not just the setting name.

Quantizing strength (where available)

Some versions offer a quantize strength or amount, which pulls notes partway toward the grid instead of snapping them exactly. This is a good middle ground — timing gets noticeably tighter without turning into a rigid, robotic grid.

Scaling velocity

Rather than manually adjusting individual note velocities in the Piano Roll, you can select a whole region's notes and scale them up or down together — useful for making a whole passage hit harder for a chorus, or pulling a whole part back so it doesn't compete with a lead vocal.

Transposing

Transpose shifts every note in a region up or down by a set number of semitones, without changing rhythm or velocity. This is how you'd shift a whole bassline up an octave, move a chord progression into a new key, or match a sampled/loop-based part to the rest of your song.

Transposing a region is different from transposing your whole project's key — region transposition only affects the notes inside that specific region.

A practical workflow

1. Record loosely, focusing on feel rather than precision.
2. Fix any individual outlier notes by hand in the Piano Roll.
3. Apply a light quantize pass to tighten up the overall performance.
4. Scale velocity and transpose as needed to fit the arrangement.

Recording loose and fixing in post like this usually sounds more natural than trying to play perfectly quantized in the first place.

What's next

With your MIDI performances tightened up, the next lesson covers Smart Controls in more depth — shaping the actual tone of your instruments, not just their notes.