I understand the mathematics of what you are saying but struggle to believe that sampling at peak with one phase position and zero crossing with another phase position can be magically nullified by filtering and how this will not effect amplitude? eg I am looking at a wave of 19kHz sampled at 44.1Khz. when sampled at 12deg we are looking @ ~+0.25% for 270deg. How can this be accurately reconstructed? I might be seriously missing something but am not clueless as I am qualified in electrical / audio / illumination engineering and have worked with this issue for years. I am open to further input for enlightenment (not being sarcastic). Send me a way to mail you my xls / ods on this for comment. Skype / email ...

one assumes 44.1KHz is ok to reproduce 20KHz audio... This is WAY too simplistic. Take a ~15KHz sine wave and apply a phase shift to it. Sample it at 44.1KHz. Look at the amplitude modulation you get on the output. 44.1Khz is terrible for audio. The distortion from 10KHz up when sampling waves with phase shifts, harmonics, modulations ie complex forms is very high. An example would be to mic up a cymbal with a mic perpendicular to the edge. Beat the cymbal. It makes high frequency sound but it also rocks (not http://www.rocksclusters.org/wordpress/ ). so on top of the complex wave with harmonics etc one gets phase shifts and Doppler effect. I have mathematically reproduced this to try to show the reasoning behind my understanding of how 44.1 just really is not enough and the effects were worse than I thought. 96Khz seems a good starting point to sample the audio spectrum up to 20Khz reasonably reliably.

I upgraded my machine, as i do often because i build them and office decided that i had pirated it and it stopped. NO EMAIL!!!?!?! it was all waiting for me upon a new license. So i called my lawyers and got them reading the EULA. What we discovered was that Microsoft does not specify exactly which hardware you can or cannot change and how many times you can or cannot chage that hardware. So I called their head office in our country (spoke to someone important) and let them know that i will be suing them for loss of productivity... They immediately sent me a brand new package, couriered to my door and she told me they new that this would start happening... So! There you have it. Legally threaten them, it has worked for me so far.