If you activate "Tie" to the left of the Gate pattern window, you can create longer notes (eighth notes, quarter notes etc). A quick way to draw tied gates is to hold down [Shift] when you input the gate values.
Each step that has one tied gate value will be twice the length compared to a normal step.
Tied gate steps are indicated by being twice as wide in the pattern window.
If two or more notes of the same pitch are tied together, the result will be even longer notes.
Tied notes are also essential if you want to create typical TB-303 "Acid"-type lead lines.