sir,what I want to do is to make a voice changer software on windows platform like AV voice changer.Thank you. ----- Original Message ----- From: Karthik Gurumurthy To: wdmaudiodev@xxxxxxxxxxxxx Sent: Thursday, June 25, 2009 5:32 PM Subject: [wdmaudiodev] Re: How to filter microphone voice? What exactly you want to do? 2009/6/25 kevinrich47 <kevinrich47@xxxxxxxxx> Hi all,Is there anyone know how to modify MSVAD sample to make a voice changer?Thank you. Some docs on the web say modify CopyFrom or CopyTo function in the BaseDma.cpp can do this, But I don't know how to do it,Could you please tell me how to start?Thank you very much.