just do it, i like it very much,You can google that. It deals with the ability of people to hear subtle differences in samples separated by time. Human auditory memory lasts no more than a couple of seconds.thanks

great.She bought me a MOMO tach watch last year and a David Yemen(I think that's it) when I got promoted. I have no idea what these watches cost but i do know my wife wears very nice watches herself and likely spends the same kind of money on the ones she buys me.thanks for your sharing.