It's too bad we can't see more than that little bit. Can't tell much from it!
But here are two stabs in the dark -- extend the out point of the source audio layer, or extent the out point of the soundkeys layer.
EDIT: Sorry, turned out those were actually keyframes. I can manually add more till the bar gets long enough. The real question now, is there any other quicker way to add keyframes? Cause that would mean I wouldn't have to manually add keyframes.
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I can manually add more till the bar gets long enough
why would you add them manually when it is supposed to add them for you? there is something wrong with how this is working for you. try this:
although I see your work area is extended, try hitting apply again when it is. meaning you should extend your work area to get it to analyze more of your audio layer and then hit apply:
try reading the manual or following a tutorial or two about it: Red Giant | Getting Started with Trapcode Sound Keys