Hello, After solving my first quest of macosx programming, thanks by this forum, I have to start a new thread with another subject... I need getting audio stream from the default input (microphone or line-in) to process it (for example getting the signal volume) in a loop. I don't need to store audio data after getting it. I suppose that CoreAudio is the right place, but as a noob, I cannot understand how to accomplish it... I would like to do it in pure C++, because this is the first part of a project that will involve OpenGL. Could someone put me on the right way again excuse me again if my english is bad...I hope is clear enough... Thanks a lot!