Fala rapaz tudo certo?
Vou te postar uns links que podem te ajudar
http://www.vbforums.com/showthread.php?t=388562 http://vbforums.com/showpost.php?p=2368936&postcount=13 http://vbforums.com/showpost.php?p=2398766&postcount=18 http://www.vbforums.com/showthread.php?t=336074
http://www.codeplex.com/naudio
http://www.codeproject.com/KB/audio-video/PeakMeterCS.aspx
Esse aqui é em C# mas deve ajudar
http://www.codeproject.com/Articles/20025/Sound-visualizer-in-C
Abraços!!
Att, Felipo Gonçalves | Microsoft Contingent Staff