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1.if i download my music from tape/lp on my laptop will the quality differ if i would have downloaded the music on a computer with super sound card or will that first have a effect when i make playback. means can i download music now without quality loss, all songs will be downloaded in FLAC.
2. whats the best hardware or software to do this
This is very important the quality must be TOP.
For the LP material, first make sure you have a good turntable. Look around, and you will find that there are now audiophile-quality USB devices intended ONLY for capture from a turntable. (They have a good-quality preamp built-in.) Of course, you will probably want to apply a "scratch and pop" software filter after you've captured it.
In general, external USB devices stand a better chance of doing a good job than internal cards. Internal cards have a horribly noisy electrical environment to work in. Built-in sound on mother boards and notebooks are notoriously noisy - particularly on inputs. (Most today are not bad on outputs.)
The humble Soundblaster, in any reasonably-recent incarnation, actually isn't bad, (any Audigy-series are decent) though "golden ear" audiophiles will beg to differ. The very early Soundblasters were awful, and stuck them with a bad reputation early on. The are more professional solutions, though, either internal or external. Check a professional sound catalog, such as BSW.
Wish I could be more specific about products, but I don't have a need for this myself, and am not that familiar with current products. I just have enough knowledge on the subject to be dangerous. I was involved in developing the first sound card for notebooks, and was the one stuck with doing the audio testing.