[2.0] applying effects on a wav file

dearr friends

can any body help me.i am developing a small product wav file editor software.i want to add different effects on a particular location of the wav .can any body suggest me ?or can any body tell me is there any dll that performs different effects like

fadein
fadeout
amplify increase
amplify decrease
normalize
insert silence
delete silence...................

or can any body suggest a C# book that deals with wav and sound file applications .



regards
kishore

it is recommended to use Managed DirectX for this stuff, check out http://www.microsoft.com/directx

download the SDK and follow through some of the tutorials