Piano roll

Double-click a clip on the timeline to open the piano roll. This is the main note editor.

Four tabs

The tabs along the top of the piano roll:

Tab	Role
Piano Roll	Place and edit notes with the mouse
Step Sequencer	16-step style grid editor (details)
Code	Generate notes / CC with JavaScript (details)
Render	Inspect the result of the Code tab (the generated notes)

Each tab is independent per clip, so different clips can use different editing modes simultaneously.

Place and remove notes

Action	Result
Click an empty cell	Add a note (using the most recent note length)
Drag a note body	Move it (in time and pitch)
Drag the left or right edge of a note	Resize it
Click a note	Select it
Shift + click a note	Add to the selection
Drag in empty space	Marquee-select
Delete / Backspace with a selection	Delete selected notes

Selected notes are highlighted, and you can edit them in bulk with keyboard shortcuts (below).

Keyboard

Active when the piano roll has focus:

Key	Action
`Esc`	Close the editor
`Up` / `Down`	Selected notes +/- 1 semitone
`Shift + Up` / `Shift + Down`	+/- 1 octave
`Left` / `Right`	Move by one grid step
`Q`	Quantize selection with the Quantize panel settings
`Cmd/Ctrl + D`	Duplicate selection by its span
`Cmd/Ctrl + C`	Copy
`Delete` / `Backspace`	Delete

For the full list, see Keyboard shortcuts.

Grid and quantize

The grid field at the top of the piano roll sets the resolution.

Presets: 4 / 8 / 16 / 32 / 64 (steps per bar)
Or type any value (1 to 256)
Default: 16 (16th-note grid)

Note placement and arrow-key movement follow this grid.

Quantize panel

The Q button next to the grid field opens the quantize settings:

Control	Meaning
Grid	Quantize resolution as a fraction of a beat. Dashed underline = triplet
Strength	How far notes move toward the grid. 100% snaps exactly, 50% moves halfway
Swing	50% is straight. Higher values push off-beat notes later
Quantize note offs	Also snap note ends to the grid. Off keeps the original note length

While the panel is open, the notes that would move are shown as dashed ghosts, so you can dial in strength and swing before committing.

Press Q or click Apply to quantize. With no selection the whole clip is quantized.

Humanize is deterministic: the same note always gets the same offset, so the preview matches the result and undo/redo stays stable.

Quantize while recording is off by default. When on, notes are corrected the moment each note finishes recording, so what you hear while playing is never delayed. It can also be toggled from the Q button in the transport bar (right of the metronome) or in Preferences -> Recording.

Zoom

Control	Action
H slider	Horizontal zoom (pixels per beat, 16 to 256)
V slider	Vertical zoom (row height, 8 to 32 px)

Adjust to taste depending on note density.

Clip length

Use the length field at the top of the piano roll to change clip length (in bars). Like resize on the timeline, this is non-destructive — shortening preserves note data.

Velocity editing

The Velocity Lane at the bottom of the piano roll shows each note’s velocity as a vertical bar. Drag the top of a bar to change a single note’s velocity.

CC automation

Click the + CC button at the bottom of the piano roll to add a CC lane. See CC automation for details.

Detach (floating)

Click the detach icon at the top-left of the piano roll to pop it out into a floating window, so you can see the timeline and the piano roll at the same time. Click again to attach back.

Edit clips — clip-level operations on the timeline
Step sequencer — step-grid editing tab
Coding Note Effect — generate notes from the Code tab
CC automation — add and edit CC lanes