klevgrand BRUSFRI User Manual

Welcome!

This is the user manual for Brusfri*, a plugin effect available for iOS (Standalone & AUv3)
and Mac & Windows (AU/VST/AAX). It’s been designed and developed by Klevgrand, a
small studio in Stockholm, Sweden.

* Brusfri means noise free in Swedish.

Get the iOS version at the App Store

Get the AU / VST / AAX version at klevgrand.se

In short, Brusfri reduces different kinds of noise. Using it is simple, and in most cases no
parameters need to be tweaked by the user. Still, to get it to start reducing noise, you need
to feed Brusfri with a short noise sample (containing nothing but the noise to be removed).
To do so, just play this noise for it, select and hold LEARN for about a second and you'll be
good to go.

What does it do?

Most audio engineers use expanders to reduce noise from time to time, sometimes with
good results and sometimes with not-so-good results. Brusfri uses several expanders
targeted at different frequencies. By automatically tweaking each expander setting, from
an inputted sample of isolated noise, Brusfri achieves extremely good noise reduction.
Thanks to its analyser, it is capable of reducing almost any kind of noise; if a 50Hz hum is
fed to it, it'll only reduce that hum while leaving other audio untouched when processing.
Same goes for microphone hiss, room tones (reflections, noise from fans) or electronic
static noise from cables or old vintage audio gear.

What doesn’t it do?

By not using phase cancellation techniques, the processed audio will remain sounding as
natural as possible without artifacts. This is why Brusfri doesn't handle transient types of
noise like clicks and pops.

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BRUSFRI

Noise reducer

Licensing

Until unlocked, the plug-in will output 1 second of silence every 30 seconds. To unlock the
full version, click the DEMO button (in the Info box) and type or paste your license key.

User Interface

1. LEARN

Select and hold LEARN for a second, during input of the unwanted noise, to create a noise
profile.

It's very important that the audio content only contains noise, as if there's other stuff than
noise in it, the analyser will think that is noise as well, and try to reduce it. Most of the time,
using LEARN is all that is needed.

2. ATK - THRS - REL

These parameters control all the internal expanders relatively. Select and slide.

ATK - Attack

Sets the time it will take for the reducer to start working.

THRS - Threshold

Sets the threshold curve offset. A lower value means more reduction.

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