Aliasing is a problem coming from insufficient filtering. That is actually one reason that 48kHz still makes sense to upgrade to from 44.1kHz - it makes the ant

Aliasing is a problem coming from insufficient filtering. That is actually one reason that 48kHz still makes sense to upgrade to from 44.1kHz - it makes the antialiasing filter design a bit easier because the rolloff doesn't have to be as sharp to stay above the range of hearing and below the Nyquist frequency. Neve make beautiful mixers, but it's not necessarily "better' - it just has a nice sound because the analog components colour the sound in certain ways. There are other ways to do the same thing though - as long as you have good enough preamps and digitisation, you can download characterisations of certian amplifiers/mixers to apply to your digital signal. This is massive in guitar effects - you can download basically any vintage amp and sound basically identical without having to ship around heavy amps with delicate tubes in them!