> take raw input from the players needle, and fix all sound problems easily.
The problem is that the computer doesn't 'know' what is an audio problem and what is actually the audio as was intended by the recording engineer.
That said, some audio artifacts - such as clicks and pops - can be detected by a computer with a fair degree of confidence and then minimised. However, this isn't normally done on the fly when listening, but rather after the vinyl audio has been transcribed to a computer. Various filters, including de-hiss and de-click are available in many audio recording packages. YMMV.