Downmix to mono audio (for headphones) possible? - Android Q&A, Help & Troubleshooting

I have an .avi file with a 5.1 audio stream, but the stream is messed up - most of the sound is coming out of the FR channel, because it was improperly encoded from a mono or stereo source. I can watch the video ok on a pc if I use gomplayer and set up AC3 decoder to downmix to mono - the audio from all channels is mixed and played through L and R channels of headphones.
The Question is:
Does android have an app or a plugin to downmix to mono audio, for Nexus 7?
I know Voodoo control panel can do this, but it doesn't work with N7.
I also tried a number of players -
mx player, mobo player pro, moboplayer, dice player, vplayer, rock player lite, bs player. There may have been a few more I don't recall at the moment.
None of these players have the option to downmix to mono.
Can anyone help please?
Thanks.

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Forgive me, I'd like to bump the thread to see if anyone knows of a more elegant solution.

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Try DSP Manager's Headset Virtual Room Effect and select a room type that sounds best for you. I am deaf in my left ear so I needed all my audio downmixed to mono and this did the trick.

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edditnyc said:
Try DSP Manager's Headset Virtual Room Effect and select a room type that sounds best for you. I am deaf in my left ear so I needed all my audio downmixed to mono and this did the trick.
Click to expand...
Click to collapse
How does choosing one of the Virtual Room Effect options downmix the sound to monaural? And which option does downmix to mono?

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*bump*
I too would love mono mix sound!

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Stereo-to-mono effect on Windows PC and Android
First of all, a free audio-player app called AIMP on Google Play, Android, has a Settings -> Sound -> Output -> "Mix to mono" setting, which will be useful for this need.
Secondly, while I don't know which Android app he's talking about, edditnyc is most probably right, because on a Windows PC, and depending on the sound card, you can right-click the speaker icon in the system tray (bottom right corner), click Playback devices, right-click Speakers, click Properties, click the Enhancements tab (if it doesn't exist then perhaps the sound card doesn't support the feature or the latest drivers for the sound card aren't installed), scroll down and tick Headphone Virtualization. And while this does not downmix stereo or others channels to mono, it does something that emulates this effect of mixing stereo to mono on the PC; it allows you to hear sounds that are originally only playing on the left speaker, for example, on the right speaker. And to the best of my knowledge, this should work with all sound that plays from any program on the computer, including audio players, video players, and games.
Hope this helps those who need this for technical issues or for unilateral hearing loss, at least until Microsoft and Google start to recognize this need in their accessibility settings.