If you don't have smart grid active the vertical grid lines are always quarter beats of the current measure. It would be much better if they also could be 8th, 16th or triplets depending on the snap  properties. If a Song is in 8th triplets and the grid is straigt 4th notes it looks terrible and you have absolutely no visual clue about the timing.
I hope this tweak or feature will be adressed in one of the next updates.

+1

Right-click an Audio track with Edit Filter set to Audio Transients, and choose 'Add MBT to Pool'. This will give you gridlines (and bonus hideous markers in the timeline) at global snap resolution.
 
I consider this a workaround because it's awkward and unintuitive to turn on/off, and because of the unecessarily bold and gaudy markers it puts in the timeline. A dedicated TV gridline feature would be preferable. This is one of the oldeset unfulfilled feature requests I can think of.