Windows 10 Build 10074, released in April 2015, marked a significant turning point in the operating system's auditory identity It was the first build to introduce a completely new default sound scheme , responding to user feedback for "fresh" system sounds Windows Blog A Brief History of Build 10074 Sounds
: The sounds introduced in this build (ranging from builds 10074 to 10122) served as a bridge to the final Windows 10 RTM sounds released later that year. windows 10 build 10074 sounds
By Build 10122 (just a few weeks later), most of the musical sounds were replaced with shorter, blunter, "neutral" tones—the basis for what shipped in Windows 10 version 1507. Windows 10 Build 10074, released in April 2015,
Other system events received similar treatment. The (the sound of an error dialog) was softened dramatically. Gone was the harsh, percussive "bong" of Windows 7. In its place was a short, low-frequency, almost rubbery thud—an auditory cue that suggested "please correct your action" rather than "you have failed." The (the sound of an error dialog) was softened dramatically