After a period of 3 months of listening to mp3 songs using his player with the usb stick I can say that the sound is great in headphones (5 Hz-40000 Hz), all the buttons even if some of them seem flimsy manage to do their job unexpectedly well and of course the effects although few in number contribute fully to the final sound result, that is, lows as they should be, appropriate mids and arched highs. If the 6 very important adjustment potentiometers of a higher quality had been mounted on the mixer, not like they are on this XS 6+ club model, it would have been quite successful. I recommend the product for those who want to listen to something else, not crap that makes sounds like an empty broken pot.