Look for an API for the capture devices, and then use the extern keyword to grab the external method. Do some searching on MSDN for capturing devices, but I think your best solution maybe to use the MSN Messengers built in functions for this already.You might try DirectX.Net or Look for DIRECTSHOW in msdn
Programming Audio Effects in C# 17 Dec 2002 This article explains how to create a framework for implementing audio effects in C#.http://www.codeproject.com/cs/media/cswavplayfx.asp nBASS: A sound libary for .NET 11 Nov 2002 nBASS provides .NET users with sound functionality http://www.codeproject.com/cs/media/nbass.asp http://www.codeproject.com/cs/media/#General
17 Dec 2002
This article explains how to create a framework for implementing audio effects in C#.http://www.codeproject.com/cs/media/cswavplayfx.asp
nBASS: A sound libary for .NET
11 Nov 2002
nBASS provides .NET users with sound functionality http://www.codeproject.com/cs/media/nbass.asp
http://www.codeproject.com/cs/media/#General