Hi purplegirl,I have reead your tutorial on recording audio when a user start speaking and playing it when stops speaking. It works fine for very first time but after playing any sound then the peakPowerForChannel: and averagePwerForChannel: methods giving constant values. So I cant detect sound again. If i restart my app then it detects sond for first time again. If you have solution for this problem pls let me know. johnykutty<dot>mathew<at>gmail<dot>com