1. Open attached Unity project "New Unity Project 02" in Unity 5.3.5p5 or an earlier version of 5.3
2. Load scene "LowpassFilterBug"
3. Observe the white noise sound having a low-pass filter applied in the beginning
4. Move towards the cube and observe the effect wear off.
5. Repeat #1 and #2 with Unity 5.3.5p6 or later

Actual result: the low-pass filter is not being applied in the beginning
Expected result: the filter's effect kicks in while away from the cube and gradually becomes lesser whilst approaching it

Reproducible with: 5.3.5p6, 5.3.6f1, 5.6.1f1, 2017.1.0f3
Not reproducible with: 5.3.4f1, 5.3.5p5
Regression introduced in: 5.3.5p6

The curve inversion issue was fixed in case 775328. Curves were stored in an inverted format in older versions thus they get imported into new versions that way.