Digital Recording is not so hard
Digital Recording is not so hard, only getting started is. Once you jump that first hurdle then you will be like...
"Digital recording hard? Shit, I remember when I had to worry about tape noise and tape saturation, or weather or not I could punch in and out with out the pops and clicks of analog."
Ok here are a few answers to your questions that I hope will break things down.
1: The sound card is simply the translator7communicator between the real world and the Hard Disk of a PC or Mac. it is simply a PCB (printed circuit board) that shoves into a PCI slot and takes the analog signal from your guitar and converts the Analog signal to Digital (binary i.e. 010010110100101101001100) codes that can be stored on the hard disc. Then later on when, you want to, the same sound card will change the digital ones and zeros back into an analog signal which is called (reconstructing the analog signal via a digital to analog converter)
One of the tricky things that has made home Digital recording some easy and affordable is the introduction a long time ago of what is called "full-duplex" sound cards. All this means is that you can be recording a signal i.e. guitar or vocal... and the sound card will be doing it's analog to digital conversion... and at the same time the sound card will be reconstructing previously recorded signals back so that you can listen to (monitor) guitar track 1 while you record guitar track 2. 12 or so tracks later you are a one man band. You don't have to look for this feature though... it is standard on all music sound cards. Without this feature it would be worthless.
2: A breakout box...
A breakout box is something that often come with a sound card. It is a total pain in the ass to climb around behind your computer plugging things in and out of a 3 inch x 4 inch sound card that is INSIDE a PC/Mac tower. Plus if you want to have 4 guitars with those 1/4" jacks all plugged in at once along with a couple of XLR microphones with some sweet pre-amps, plus headphoe jacks for monitoring while recordin, and volume controls and phantom power et cetera... Then all that is NOT going to be sticking out of the back of your computer. So some good sound cards come with, or you can purchase seperatly... a breakout box that has all these little gadgets and Ins/outs, pre-amps, trim knobs, aux sends. Some are quite elaborate and some are quite simple... almost cute. Go to:
http://www.midiman.com/products/m-audio/omnistud.php
This is the sound card/breakout box that I have. It costs around $300 I think, and it is marketed as a "complete studio solution". And it certainly is all that it claims to be... if you are a one man band on a budget. If you are wanting to record a full on drum kit or a stringed orchestra... well then you have no use for this little thing. It has 2 microphone pre-amps that are also guitar pre-amps... 2 "line in" inputs if you already have some outboard pres. Some other niffty stuff. Anyway, you plugg it into the sound card and then you set it on your desktop and it is like your little "in and out box"...Kind of like the wife huh? (Oooooo I am going to hear some mean comments for that one!)
3: Plug and Play: It all can't be plug and play because there are too many companies all jamming things into computers from so many companies that after it is all over there are so many compatiability issues and standards used, drivers being updated. It is all just a mess. BUT... there is light at the end of the tunnel. Most all of the sound card companies are getting their shit together and if you are just honest and tell the guy at the store... "This is what I have... I want to do this... what do I need?
Listen to what he says... write it down... DON'T BUY ANYTHING FROM HIM THAT DAY... come back, post away, ask away, research on the internet... trim off some of the needless shit he wanted to sell you... knock him down $200 and be on your way to being the next Jimmy Hendrix.
4: Do you HAVE to have a sound card. Man, these days, you don't HAVE to do anything it seems. Anyway... people are tired of all this PCI slot sound cards with their driver this, IRQ interupt sharring computer jargon blah blah blah... so now there are coming out almost daily tons of outboard gear that goes into the PC/Mac via some other data exchange toy... (ieee 1394) Firewire, USB (Universal Serial Bus)... all of these are PLUG AND PLAY basically... Plug that sucker into the back of your PC, jam a guitar chord in... and rock on. Here is the newest kind on the block:
http://www.motu.com/
Follow this link and then click on the word/link: MOTU 896
It is a hell of a pretty "Firewire" interface.
Anyway... be mose specific about what you want to do and I can tell you which direction to look. Are yxou a bluegrass fan that wants to record grandma blowing across a jug or are you into rave techno? Ever heard of MIDI? What do you play?
Take Care,
Mike