A gain of 50% will decrease the volume in half.The Amplify menu will open where you can adjust the gain percentage, or select a preset from the drop down menu.In the Levels tab toolbar at the top of your screen, click Amplify.To make your audio quieter or louder, use the amplify tool. Click the Play button in the Noise Gate menu to preview the changes before clicking Apply.In the Noise Gate menu, adjust the threshold slider to your desired level, or select an option from the preset menu.Click Cleanup > Noise Reduction > Noise Gate.To remove background noise based on threshold:
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Select Noise reduction from the menu, then select Spectral Subtraction based on Noise Sample.In the edit tab toolbar at the top of your screen, click Cleanup.Click and drag your mouse to select a portion of dead air from your clip (a section that captures the background noise of your file).To remove background noise based on a noise sample: There are many ways to remove background noise from your file in WavePad.