MuVo V100 suddenly distorts sound output, hates vocalists

9MuVo V00 suddenly distorts sound output, hates vocalists Greetings. I have a MuVo V00, which until quite recently has worked according to specifications as desired. After a period of nonuse, upon reinstatement it showed a global distortion in sound output, resulting in--impressi'vely--vocal frequency-range portions of files to be suppressed. Never mind that some music was improved in this way--it is an error that needs rectification, and unfortunately MuVo V00 models are past the End of Service Life.
I have downloaded the firmware patcher, and reapplied the latest firmware (which I had already had on the device, but consensus in various problem threads here leads one to believe that refreshing the firmware is a borderline panacea). No good. Swapped batteries on a hunch, no good. Swapped headphones, no good. Checked the files that are actually on the disk, they sound like they ought when played through the computer's means. I'm low on ideas, and the last person who asked this question here did not receive a reply. Anything spring to mind?

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Imac DV G3 (PPC) speakers suddenly distorted sound output

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At higher volumes you can even see the speaker cones vibrating.
That is normal. If they don't move, they don't work.
However, it could be that someone else overloaded the speakers and caused them to fail. I think the first step is to see if the speakers have been damaged. Use a pair of external speakers or headphones and test the sound.
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Hi, I've Mac Book Pro 15" with Retina display. Yesterday suddenly the sound output from my Headphone is not working. When I tried to solve this, I've noticed in system preferences it's jumping from Internal speakers to Head phone and vice versa. Can anyone help me on this issue please? I am using the original Apple Headset only.
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<Re-Titled By Host>

Tell us:
OS X version ?
What may have changed prior to the onset of the issue of "... suddenly... not working..." and " ... preferences ... jumping from ..." ? Software added, upgraded, updated?
what precidely do you mean by " ... preferences ... jumping from ..." ?
ÇÇÇ
EDITadded
I see that your Question has languished for some period of time without response. You have posted your issue in Using Apple Support Communities whose topic is 'How to use this forum software's interface, features and/or how to find what you wish'. It is a relatively low traffic and inappropriate forum for your problem. I will ask our Hosts to move it to " MacBook Pro " where it may get a more rapid response from your fellow users.
endEDIT

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So this morning, the sound on my MacBookPro was working perfectly, but then all of the sudden, the sound didn't work. When i turned the volume up, it showed it turning up, but there was no noise. I also tried plugging in my earphones, and it still didn't

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MuVo V100 suddenly distorts sound output, hates vocalists

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