Setting a loop

[Badore90]

I'm editing some VAG files from Dragon Ball Z Budokai 1.

There's one sound that's too loud (you can't hear musics or voices) so I decreased its volume. Now the problem is that it is a looped sound and I don't know how to set it back as it was, the sound plays one and doesn't loop at all.

I tried either setting the loop off-set to 0 and to 97328 (that's the last sample of this audio file). It works with samples, right? Or should I put some address?