What is the difference between soft limit and hard clip?

Soft limit passes the boosted signal through a smooth curve, so samples get progressively compressed near the ceiling and the output never exceeds it. Hard clip applies the gain literally and flattens anything past full scale against the rail. Soft is safer and slightly duller; hard is louder and adds harsh upper harmonics.

Does the soft limiter really prevent clipping?

Yes, and it is verified behaviour: the output approaches but never exceeds positive or negative one, and zero samples come back hard clipped. What it cannot do is leave the signal completely untouched, because the curve it applies is a form of saturation. At moderate boosts the effect is subtle; at high ones it is clearly audible.

Why does a boosted file sound duller?

Because saturation compresses the peaks, which changes the shape of the waveform rather than just its size. On the soft limit path that shows up as a slight loss of crispness on transients. If the file sounds dull, the boost is too ambitious for the material and the loudness normalizer will get you further without the same trade.

How much can I boost before it is obvious?

It depends on how much level the file already has. A quiet voice memo with a low noise floor takes six decibels cleanly and twelve with mild saturation, whereas an already hot mix will start saturating immediately. The footer peak figure tells you how hard the ceiling was pressed, which is the clearest available signal.

Does boosting also raise the background noise?

Yes. Gain is gain, so everything in the file comes up together, including hiss and room tone. If the noise becomes objectionable at the level you need, the answer is to reduce the noise first and then boost, which is a two step job using the cleanup tools before this one.

Volume Booster

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Audio Limiter

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Peak Limiter

Prevent audio peaks and clipping

Volume Booster raises the level of a file by a chosen number of decibels, with a choice between a soft limiter that cannot clip and a raw boost that can. The two modes trade a gentle saturation against squared off peaks.

What is Volume Booster?

Drop a file, choose how much boost you want and decide how the peaks should be handled, then read the output peak from the footer. The report quotes it to three decimal places and tells you which path was taken, so there is no ambiguity about whether the file clipped.

What the panel offers:

A boost slider from 1 to 18 decibels in single decibel steps, defaulting to 6.
Three quick presets at plus 3, plus 6 and plus 12 decibels.
A soft limit mode, which passes the boosted samples through a hyperbolic tangent curve so the output approaches but never exceeds positive or negative one.
A hard clip mode, which applies the raw gain and lets anything above full scale be squared off.
A footer reporting the resulting peak and naming which of the two paths produced it.

The soft limit path is soft clipping in the plain sense: a saturation curve rather than a limiter with attack and release, which is why the honest promise is that no sample is hard clipped and why the output approaches the ceiling without touching it. Pushing a signal through a tangent curve compresses the top of the waveform progressively, so a boost of twelve decibels comes back dense and slightly rounded rather than torn, and the verified behaviour is that the output never exceeds the digital ceiling and that zero samples are hard clipped. The hard clip path does the opposite: the gain is applied literally and anything that lands past full scale is flattened at the rail, which is louder but introduces the harsh upper harmonics that clipping is known for. The footer exists precisely because the difference matters and the two modes can sound similar at low boosts.

When each mode is the right one:

Soft limit is the safe choice for a quiet recording that needs to be heard, because it cannot produce the crackle of clipped samples.
The saturation it introduces is audible as a slight dulling and thickening at high boosts, so it is not free.
Hard clip is appropriate only when a little distortion is acceptable or wanted, or when a later stage will handle the peaks anyway.
Neither mode recovers headroom that was never there; a file recorded too loud is not improved by boosting it.
The tool has no meters beyond the output peak figure, so there is no gain reduction display to watch while setting the amount.
Boosting raises the noise floor along with the signal, so a noisy take comes back louder and equally noisy.

Use the soft limit path whenever the goal is simply to make a quiet file audible, since it cannot clip and the saturation is mild at moderate amounts. Reach for the hard clip path only deliberately, when you want the edge it adds or when you know a later limiter will smooth the result. If the file needs to end up at a specific loudness rather than a specific boost, the loudness normalizer is the better tool, because it works from a measurement instead of a guess.

How to use Volume Booster

Drop an audio file onto the panel, or click to choose one from disk.
Set the boost with the slider or one of the three presets at plus 3, plus 6 and plus 12 decibels.
Choose soft limit for a boost that cannot clip, or hard clip if you want the raw gain applied literally.
Read the output peak in the footer to confirm what happened, then download the boosted WAV.

When to use Volume Booster vs related tools

Volume Booster is for making a quiet file louder than it was, with an explicit decision about what to do when the boost runs out of headroom. Audio Amplifier is the plain gain tool when no peak strategy is needed, and Volume Reducer is the mirror image for turning something down precisely. When the problem is that peaks need controlling rather than overall level, Peak Limiter and Brickwall Limiter do that job with lookahead instead of saturation.

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