I wanted to preserve the sound of a vinyl record in digital format but was confused about the best way to do this. I tried plugging analog cable from a 150 dollar pre-amp into the audio in on my macbook and setting the midi audio setup in utilities folder to 24 bit 96kHz. The digital files it creates are huge so a changed it to 24 bit 48 kHz and the size was about half. Some mp3 converters are 24 bit for better audio quality even though mp3's are not 24 bit. Maybe I should stay with 96 kHz? For playback I use the optical out of the macbook into my receiver, should I use the analog out? My two questions, 96kHz vs. 48 kHz and analog vs. optical..... I setup the digital audio out to 24 bit and 96 kHz..... Third question is how should I setup digital audio out?