Manually adding hitpoints help please?

I’d like to be able to add hitpoints manually precisely on every quarter note for part of a track. Can anyone explain how to please? Is there a way to make the 1/4 notes (beats) magnetic so they go there or something like that??



Edit; What I have tried to do is;

In the sample editor…
Detect hitpoints
Put cursor on the beat that I want a hitpoint
Turn on edit hitpoints
Move hitpoint over the cursor and release

This works after a fashion BUT in the info above the sample waveform, the hitpoint might be, say, or or etc. They are never EXACTLY on the beats and it is driving me insane.