I did the following tests. Just how much and what parts does jitter effect our music. I will say what I hear but I would very much like to know others opinions as well. One of the dacs I own is in a hdvd800 by sennheiser . It's a combo dac headphone amp. The amp is very good with the hd800. But the dac gets ripped apart in reviews at least the honest ones. So I played one of my reference tracks to try and here just what changes. Well the change is jaw dropping to say the least. But I noticed it's not so much with vocals it's more with horns and most defiantly cymbals . Big time with them. It also effects the base details but also the amount. One of my songs has the cymbals with the rivets they tend to give them more air around them. Well without the AP1/PP they sounded terrible . Like they were just hissing. When I added the unit the level of clarity was amazing . But as it improved the entire sound of the song it clearly effected some more than others. Does anyone here have any thoughts on this .