One of the two stereo channels is muted in MegaCD games on Wii U

[Former user]

Original issue 315 created by JamilAlio on 2012-12-26T04:57:31.000Z:

What steps will reproduce the problem?
1.Load a Mega CD game (tested with Sonic CD with proper WAV CDDA audio tracks) on WiiU
2.The game loads and both BGM and audio effects play
3.Try to collect two rings

What is the expected output? What do you see instead?
Audio effects are expected to play in stereo, an audio effect for each of the two rings is to be played, however, only one ring is heard and the effect of the other ring (which normally comes from the other audio channel) is missing.

What version of the emulator are you using (official, SVN revision,...)?
1.7.3

Please provide any additional information below (Emulator settings, Console
setting,...)
Tested on Wii U's vWii and launched through the Homebrew Channel, Sound plays as expected on a regular Wii though, the missing audio channel in Wii U can also be noticed in the pre-game Sega copyright screen as well.

[Former user]

Comment # 1 originally posted by ekeeke31 on 2012-12-30T17:01:14.000Z:

the ring sound is not made using cd hardware so i am not sure why you think it is sega cd specific issue ?
anyway, as you figured, stereo output has been tested and works fine on wii or gamecube so the problem is obviously not within my code but rather a wiiU specific issue.

i don't have one so i can only make assumptions but this is more likely caused by a configuration issue (check your audio cables or wiiU audio settings) or an incompatibility between wii homebrew library (libogc) and vWii mode

in both cases, there is nothing wrong in the application itself and nothing i can fix