Brusfri* is a highly advanced audio noise reducer, packed into a simple and straight-forward interface. It is very well suited for cleaning up noisy audio recordings, while retaining sound quality. Unlike many other noise reducers on the market, Brusfri doesn't mess with audio phasing to suppress noise (a technique that often comes with audible side effects). Instead, multiple fine-tuned gates are used to silence unwanted noise.
*Brusfri means "Noise free" in Swedish.
Here are some examples of sound conditions that Brusfri handles well:
* Guitar amp
Press “Learn” during a couple of seconds of isolated noise to record a "profile" for noise.
Open Brusfri in any AUv3 compatible host.
There is also a bunch of parameters available that affects the noise reduction algorithm:
ATK / THRS / REL (Attack Time / Threshold / Release Time)
Threshold – basically determines how much noise to be removed. A lower value means more reduction
Attack and Release sets the time it will take for the reducer to start working.
Controls the reduction aggressivity. A lower value gives a smoother reduction.
Reduces low frequencies.
Compensates high frequencies by boosting them.
NOTE! Brusfri is CPU intensive and iPhone 6S / iPad AIR 2 or better is recommended. We highly recommend freezing/bouncing tracks to reduce CPU usage.
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Source: Apps Galore