Right-click the in your taskbar and select Sound settings .
Using an unauthorized key means you forfeit technical support and official software updates. Letasoft Sound Booster Official Licensing and Pricing Letasoft Sound Booster is a paid product that offers a 14-day free trial
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You should also consider whether the problem is actually your speakers or headphones rather than the software. If you are pushing cheap headphones or small laptop speakers to their limit, using any software to boost volume further can lead to significant audio distortion and could potentially damage the speakers. In this case, a better investment might be a decent pair of external speakers or headphones.