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Don't use a normalizer + a bass booster simultaneously. You'll get distortion. Pick one tool. sound normalizer android
Interpretation: You are telling the phone: "Whenever the audio gets louder than -25dB, squash it down by a factor of 4. Then, bring the entire volume up by 5dB." Free with ads
A powerful standalone engine that offers advanced compression settings to prevent audio clipping and sudden spikes. sound normalizer android
Most people experience volume jumps between different songs or videos. Most major media apps have a "Normalize" toggle built-in: