Wine additives

[Tnoodle]

Is there a resource that I can read that will tell me what the following will actually do to my wine?
1. Acid blend
2. Tannin
3. Pectic enzyme
I have searched all of them on here but it just shows all the threads that use those words, which is almost all of the wine threads.

 

[Yooper]

Jack Keller's website is my winemaking Bible! He has all the best information, and hundreds and hundreds of recipes for every conceivable type of fruit!

Here's his page on additives:
http://winemaking.jackkeller.net/additives.asp

 

[Tnoodle]

Thank you