Voice Recorder (Sound Recorder before Windows 10) is an audio recording program included in most versions of the Microsoft Windows family of operating systems. Its user interface has been replaced twice in the past. Evolution Sound Recorder has been in most versions and editions of Windows since Windows 3.0, including Windows 9x, Windows Server and the client versions of Windows NT. Even Windows Mobile came with one. Its user interface and feature set saw very little change until Windows Vista, when features that lacked practicality were discontinued and Sound Recorder was simplified. This version of Sound Recorder was included in Windows 7, Windows 8 and Windows 8.1, but did not make it to Windows 10. A second, different Sound Recorder was introduced in Windows 8.1, thus Windows 8.1 has two distinct apps called Sound Recorder. This second app was a Windows Store app and adhered to the design tenets of the Metro design language. Leaked images of a preview version Windows 10 Mobile showed this app too. When Windows 10 released, however, it was renamed Voice Recorder. The original Sound Recorder was removed from Windows 10. Features Voice Recorder (known as Sound Recorder before Windows 10 and for the majority of its history) can record audio from a microphone or headset. In addition, many modern sound cards allow their output channels to be recorded through a loopback channel, typically called "Wave-Out Mix" or "Stereo Mix". Before Windows Vista, Sound Recorder was capable of: Playing the audio files that it has recorded Converting the bit rate, bit depth and sampling rate of the audio file Inserting other audio files at the beginning, end or the desired location of the current audio Splitting out parts of the current audio clip Increasing or decreasing volume in 25% increments Increase or decrease playback speed in 100% increments Adding an echo (without reverberation) Reversing the current audio clip These features, however, were either removed in Windows Vista or taken over by other applications. The playback and trimming features reappeared in Voice Recorder, although Voice Recorder can only play its own recordings. Sound Recorder accepts command-line parameters. This was removed in Windows 8, as Windows Store apps cannot be run with a parameter from the command-line. File format Before Windows 7, Sound Recorder could save the recorded audio in waveform audio (.wav) container files. Sound Recorder could also open and play existing .wav files. To successfully