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Sansa Clip+ rockbox audio volume problem

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transcendent12:
Have a strange issue where I get some sort of volume modulation when playing some tracks. Quite difficult to detect definitively. But on one of my albums, (Deloused in the Comatorium by The Mars Volta). In the main congested chorus parts where all the instruments converge) the volume will dip very noticeably and kind of waver. I do NOT get this with standard firmware.
Looked around the forum and haven't seen any other reports of this.

Any technical explanation for why this may occur? I've looked through the settings for any sort of normalisation or DSP effects and disabled them.

saratoga:
Do you have the compressor enabled?

transcendent12:
Compressor is definitely disabled. Format of song is MP3 V0 and i tried two separate rips with same results. I also tried playing from external/internal memory and also a 320kbps CBR mp3. Same results. It's quite distracting; a bit like someone randomly varying the volume of/sweep filtering the vocals mid mix.

Don't really notice it on any of my other music. But i know that it will ignore me knowing that it is possibly there depending on the audio content...

saratoga:
Could be some kind of hardware problem with the amp or mixer on your player, something wrong with the files or our decoders, etc.  From what you've said though I don't have any specific idea. 

Miarld:
Same here. On tracks that involve wide frequency range (i.e. death metal) the volume tends to alter. Sansa clip+ 3.9.1, no compressor, no problems on original firmware.

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