Mega Sound Recorder can record the sound coming from any audio source in your PC: standard sound in, microphone, speakers or from the Internet.
Among the options in this sound recording suite, you have automatic silence detection: the recording is paused if the signal drops below a minimum level.
You can also program the sound recording at a set time and date, indicating the source of the capture. You can choose the exit format (WAV, MP3, WMA, OGG, VOX, AU or AIFF) and also the quality of it. It has support for hotkeys.