Gridshift uses a consistent modifier hierarchy throughout the application. Once you learn these patterns, you can predict how shortcuts work across different contexts.
Modifier
Purpose
(none)
Move the selection — or the cursor, with nothing selected
⌥ Option
The same step, finer — or zoom, with nothing selected
Fn
The far step
⇧ Shift
Extend Marquee selection
⌘ Cmd
Object navigation (select clips, notes, points)
⇧⌘
Multi-selection (add to selection)
⌃⌘
Change length (timestretch a clip, resize a note)
Objects move on the bare arrow keys: whatever is selected is what the arrows
step, and the cursor takes them back once nothing is.
Option = Fine ModeOption on its own is the fine step of whatever is selected — 1/8 of the grid on screen instead of the full grid, so it gets finer as you zoom in — and it stays the zoom while nothing is selected. It also makes marquee extension finer. While dragging, Option switches snapping off entirely.