Awesome! You love music so I assume you have good headphones to test.
This is what I used for the test, Klipsch S4's....my favorite everyday drivers, medium - high quality MP3's and of course my sparkly, new V10. So nothing way overboard for this test, pretty common stuff. Listened to a wide range of rock music (traditional, funk, alternative, blues, etc.).
Based on my initial experience, this is a good news and bad news story..........................
First the good news, the ESS DAC is awesome! I compared the stock player and DAC to the stock player with the ESS DAC. There is a noticeable improvement in sound quality. The sound stage was better defined, the highs regained some sparkle, the mids were clearer and the bass was fuller. Basically this is what I would expect from a better quality DAC. So if you enjoy LISTENING to music versus using music as background noise, you will really enjoy the improvement.
The bad news, the ESS DAC only works with the stock player, it had NO EFFECT when I used PowerAmp. How do I know (besides the lack of expected sound improvement). On the menu panel that turns the ESS DAC on/off there are also two controls to individually control the volume on the left and right headphone channels. With stock player using the ESS DAC, when I turned the left channel down, the sound from that side went "dead," as you would expect. When I used PowerAmp there was no change indicating to me that PowerAmp was not using the ESS DAC.
What is confusing is that the Hi-Fi icon remained on in the notification bar when using PowerAmp (indicating that the ESS DAC was active) even though it clearly was having no effect. This is where I believe the false positives are coming from.
Now for an observation........PowerAmp sounded almost as good by itself as the stock player using the ESS DAC. I can only imagine what PowerAmp would sound like if it could access the ESS DAC.
I did not test streaming or Bluetooth, but I don't expect the ESS DAC to be active in these applications. I would expect that in the future somebody will find the application code that allows the stock player to use the ESS DAC and find a way to use it with other media players.
Sorry for the bad part, seems like you have to use the stock player and the headphone jack to enable the ESS DAC. Another quick observation, if you are using over-ear cans that require big ohms to drive, you won't be giving up your outboard DAC and power amp. While the V10 puts out plenty of volume, you'll still need more power for those audiophile, big ohm cans.
Final word, the stock player with the ESS DAC sounds awesome. Later when I can have some quality listening time, I'll pull out my B&W P7's and provide another report.