Don't know why this worked?

I got footage from a corporate event that was recorded on a AJA Ki-Pro drive and dumped it into final cut pro 7. Put the footage on the timeline and noticed that the audio in the footage was very very low. Just barely hitting. I highlighted the video track and two audio tracks and then selected link and stereo pair in the top menu bar. After doing this the audio tracks were coming in on normal levels.

I just don't understand why that boosted the sound with out noise or distortion? Were my project settings just setup incorrectly?