I downloaded the payed version of DFX and watched a movie this evening with my sennheiser hd598's on. I must say that I'm very impressed by the audio. Really clear and good detail with more then enough bass without being to bassy. I also seem to be blessed with a Chuwi that doesn't suffer from static over the 3.5mm output which is also helping in the overall listening experience. Great little audio program and a very good upgrade from the standard onboard audio.
@Yayo, The touch sensitivity is really good. You do need to change the touchsetting.gt file for the one provided by Loly. When you have done this it's really responsive and you won't find any obstruction from the glass screen protector.