Emulator

Game Name?
Mario Kart Wii

Game ID? (right click the game in the game list, properties, info tab)

RMCP01

MD5 Hash? (right click the game in the game list, properties, info tab, MD5 Hash: Compute)

aa073c7653f3af6a83320b2cba66ba37

What's the problem? Describe what went wrong.

When a red shell, blue shell, star, thunder cloud, mega mushroom is coming behind me, its indicator's sound effect is completely missing. (A link is below to a video in which the indicator shows up but its sound effect is completely missing.)

What steps will reproduce the problem?

On my PC just simply run the game and wait for one of the above items incoming

Which versions of Dolphin did you test on? Does using an older version of Dolphin solve your issue? If yes, which versions of Dolphin used to work?

1. Every stable version which is available: 3.0, 3.5, 4.0, 4.0.1, 4.0.2, 5.0, and some dev versions (4.0-9507, 5.0-78, 5.0-274 (at this time it was the latest dev version))
2. No, it didn't solve this issue.

What are your PC specifications? (CPU, GPU, Operating System, more)

CPU: Intel Core i5-4670K Quadcore @ 3,40 GHz 3,40 GHz (not overclocked)
GPU: AMD Radeon R9 200 series (not overclocked)
OS: Windows 8.1 Pro x64
RAM: 16 GB

Is there any other relevant information? (e.g. logs, screenshots,
configuration files)

I tried every audio option with every possible combination (HLE emulation, LLE recompiler, LLE interpreter with XAudio2 and OpenAL with and without the Dolby decoder) and all worked fine except that one sound effect.
https://www.youtube.com/watch?v=w-ZZuVw4bP0&feature=youtu.be

I saw in other's videos that for them this particular sound effect is there, is not missing. And this is why I'm writing here because I saw it working.

(If this isn't the right place to write this report, please move to its proper place because I would like to get answers for this problem of mine.)