Object move up    ⌥↑

Position an object in the MIDI Environment using fine controls. Position changes by one pixel (it used to be a much bigger and visible thing). Use the option-key and the arrow keys.

Bygone days for most users of Logic Pro.

Adjust position, size of objects in the Logic Pro Environment — Apple Support

In Logic Pro, use the following key commands to move selected objects one pixel in the relevant direction, even when the grid is turned on:

• Object move left
• Object move right
• Object move up
• Object move down