well, i am aware that it may sound kinda weird. i still have to figure out how to explain it technically to myself, i will spare all the stuff of conspiracy around this, as for now, it is just a feeling. on the other hand, talking about "out of thin air", it is actually said, people around the world, (Tibetians, Indians, Azteks, Aborigines, and so on) naturally tuned the reference to that frequency, also great singers did in our days - John Lennon, Bob Marley, the recently "haunted" Adele, Luciano Pavarotti even did kind of rant considering that, supported by other great singers in his business, just to mention a few - will see what further investigation leads to point. nevertheless thanks for your serious reply! i honestly did not expect that. good point with the songs tuned out of the today's common E-standard. i did not really try so far, i played couple of maiden, metallica and aerosmith songs (all A440) about half an hour, additonally i contested pure tones in A440 and A432, guess what, i even tuned down some *.wav files with an audioprogram. but time will tell if this can be considered false or true, finally. will try out your mentioned solution asap... vielen dank pg