Selection Tools

The piano roll provides several tools for editing notes after they’ve been placed. Switch between tools using the toolbar at the top of the piano roll. Two-finger gestures work identically regardless of the selected tool.

Select Tool

• Tap any note to select it (replaces previous selection) — the synth plays it
• Tap an empty cell to deselect all notes
• Drag across an empty area to draw a selection rectangle and select multiple notes at once — all notes intersecting the rectangle are selected on release
• The selection rectangle is blue (RGBA 0.47, 0.71, 1.0 at 8% fill, 70% stroke)

Moving Selected Notes

• Long-press (0.5s) and drag any selected note to move the entire selection
• All selected notes move together, preserving their relative positions
• The synth plays a chord during the drag, and a live note name indicator shows the current pitch as you drag vertically

Resizing Notes

Change the duration of any note without reselecting it:

• Drag the left or right edge of a note to shorten or lengthen it
• The edge turns into a resize handle when your finger is close enough
• Resizing snaps to the current grid quantization setting

Eraser Tool

Switch to the Eraser tool from the toolbar to delete notes:

• Tap a note to delete it immediately
• Drag across notes to delete every note touched by the finger path — each note is only deleted once per gesture
• This is faster than selecting and deleting individually when clearing large areas

Two-Finger Gestures (All Tools)

Two-finger gestures always take priority over single-finger tool actions.

Gesture	Action
2-finger horizontal drag	Pan/scrub the timeline left and right
2-finger vertical drag	Scroll through octaves (higher/lower notes)
2-finger horizontal pinch	Zoom timeline in/out
2-finger vertical pinch	Zoom octave range (fewer octaves = larger note rows)

The axis is determined once the initial pinch movement exceeds 12pt.

Undoing Mistakes

All editing operations — including deletions — are undoable. Tap the Undo button in the toolbar to reverse the last action.

Tip: See Undo & Redo for a full list of reversible operations.