I'm experiencing a bug I already had in 0.7.5, but was solved in 0.8. Now in 0.8.2, it's back... :-(
When I use either the "Amplification" or "Volume", and set a value <100%, the sound clip is muted. The rest of the timeline is not affected.
If I set the value to something >=100%, the sound is played.
I guess the "Volume" effect is only a keyframe generator for the "Amplification" effect, so it's the same bug in both effects.
If anyone has a solution or a workaround, I would greatly appreciate it.