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I'm in a workplace that only allows one headphone in. This makes some music pretty awful, only having one channel. I'd like to mix my audio into one channel, but this seems to be a bit more difficult than you would expect. I don't want to buy a paid app, and I'm playing music from my Google Music library, so alternate players aren't an option.

Is there any way to do this digitally? I don't want to have to buy an adapter and have it sticking out of my phone, risking my headphone jack, just to play mono.

I'm on a Droid X2 running CM9. I know some of the manufacturer ROMs had mono options, but it's not in stock Android or CM9.

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Do they make you cut your headphones in half?! –  Michael Hampton Jul 23 '12 at 14:51
    
Haha no, but it's open cubes and I'm visible from the elevator lobby, so I'd rather not be breaking any rules. –  Littlegator Jul 23 '12 at 15:06
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4 Answers

You could use Poweramp. It has tons of sound settings including a mono option.

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Yes, but that is a paid app. I suppose I should have specified that I don't want to pay. Also, I'm using Google Music, so I believe this is out of the question. I'll edit to specify more. –  Littlegator Jul 23 '12 at 15:03
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A lot of bluetooth headsets only play mono sounds, though you generally won't get the sound quality as you do from a wired headset.

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Yeah, I'm a bit of an audiophile and I couldn't stand bluetooth. I also have 10-hour work days, and I don't think my bluetooth headset would last the day. –  Littlegator Jul 23 '12 at 15:07
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There's a setting under accessibility options for mono audio. I haven't tried it yet, but it may be what you want.

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I'm not seeing this. It might be a feature in Jelly Bean or a proprietary feature to your ROM. –  Littlegator May 30 '13 at 14:24
    
I've tried this on mine (a Samsung Galaxy Win Duos) with DoubleTwist just before I saw this question and it didn't made the playback mono. :S I have to avoid Play Music now, because it downloads music to the internal storage (Built-in acts as SD) instead of the external one (MicroSD card). –  Adam L. S. Dec 10 '13 at 20:05
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One can use ffmpeg:

avconv -i input.mp4 -c:v copy -c:a libmp3lame -ac 1 out.avi
avconv -i input.mp3 -c:a libmp3lame -ac 1 out.avi
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This does not apply, since the OP mentions he's playing music from Google Music, not from local files. –  onik Jun 17 at 6:34
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