Right-click the speaker icon → Sounds → Playback tab → Select device → Properties → Enhancements tab → Check "Loudness Equalization." This boosts quiet sounds but compresses dynamics. It is free and safe.
Even in exclusive mode (where an app takes direct control of an audio device), Sound Booster can intercept and amplify the audio stream before it reaches the hardware. This lets you boost quiet applications (e.g., a movie, game, or VoIP call) that use exclusive access — something Windows’ native volume control can't do once an app locks the device. patcher letasoft sound booster exclusive
youtube.com/watch?v=KblYiJyUtYs">FXSound or instructions on how to use the features? Download - Letasoft Sound Booster Right-click the speaker icon → Sounds → Playback