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We probably won't see an update until Windohs 8 is finally released. 
I have a dv4t-5100 that is doing the same and my G60 which is 3 years 7 months old played music better than this thing. I see them as another Toshiba who says they are going to release a update soon and miss it by a couple of miles. Welp, I won't be holding my breath for an update anytime soon and if it does come out sooner than later that will be a miracle.
May have found a possible workaround and/or fix for this problem.
Right click the volume icon in your taskbar and select "Playback devices"
Then double click "Speakers and Headphones" (see photo below)
Then click the "Enhancements" tab and check the box for "Loudness Equalization" (see photo below)
Then select "Settings..." and change the Release Time to "Long" (see photo below)
Then select the "Tone Controls" and set the Bass to 1 (see photo below)
I also have a customized Beats equalizer so I don't know if this will work for everyone. The quality of the music gets a little decreased when turning on Loudness Equalization but it's better than hearing the volume on the song go up and down every two seconds. Let me know if this works for anyone. Here is a picture of my Beats audio settings.
