Redeye, the swings are supposed to be that quiest. If you swing/spin it fast and trigger a bunch of swings together, it sounds more normal - but not overwhenlming. But, yes, you're hearing them correctly. I should know - I made the font.

If it's still too quiet for your taste, then you can always swap in a different sound font, but unfortunately it's not possible to make the swings louder without having to completely remix the font using the original sound... and those are long gone... sorry, man.