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Letasoft Sound Booster enables increasing volume on your computer to up to 500% of the original maximum.

The program works by integrating with Windows (installing a new Audio Processing Object, if you're interested), which means it should automatically increase the volume of all your applications, no other setup required.

Basic operations are very simple. Tap a system tray icon, a volume slider appears, and you increase it to whatever you need. This should work immediately everywhere else.

You can also increase or decrease volume via a configurable hotkey.

The default settings should work for most people, but if you have problems, the Preferences dialog allows choosing a different boost mode. We had no idea what might be best - should you use "injection", or not? who knows? - but it's easy enough to try and option and just see what happens.

Please note, the trial version is fully featured but has one minor restriction: every ten minutes it stops amplifying sound for around three seconds.

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Letasoft Sound Booster noticeably increased system volume for us, but the higher we went, the more crackles and distortion we noticed. We managed to amplify volume by around 25-30% without any issues, and increases of up to 100% were acceptable for undemanding applications (watching TV). That's worth having, but you might be able to achieve something similar by installing a free audio equalizer.