Brusfri launched – Klevgränd add a noise reduction tool to their iOS music app collection

Download from iTunes App StoreI’ve reviewed a number of iOS music apps from Klevgränd Produktion here on the blog over the last year or two – Vandelay, SquashitSvep, RoverbEnkl, WeeelKorvpressor, PressIt,  Esspresso, Jussi, HaazePads and Baervvag amongst others.

A number of these are also available in an AU plugin format for these working on an OSX desktop system and Klevgränd took a pretty bold step a few months ago when the also added AU support under iOS; it was great to see… and, in every case, I’ve been impressed with the creative possibilities that these apps provide. In addition, the novel – and very streamlined – user interfaces are ideal for the AU format.

Klevgränd have launched a further app today – Brusfri – and this is something a little different from their audio effects and virtual instrument app offerings to date. Indeed, as Brusfri is essentially a noise reduction utility processor – something that I’ve not seen before under iOS – it is perhaps ‘something different’ full stop.

Brusfri – Klevgrand bring noise reduction to iOS.

As with all their recent releases, Brusfri is delivered in formats for desktop (AU, VST; available from Klevgränd’s website) and iOS (AU). Again, there is no Audiobus or IAA or standalone option under iOS; Klevgränd see AU as the future and so are focusing on that format. Under iOS, the app is universal, requires iOS9.1 or later, is a 17MB download and is launched at UK£7.99/US$7.99 price tag.

Software for doing audio restoration on the desktop is pretty commonplace and – in one form or another – has been around for many years, although, at it’s very best (iZotope’s RX options for example, it is not cheap). Brusfri uses a technique that’s found in many of those desktop utilities where you ‘play’ it a bit of the audio signal that contains just the noise element, it ‘learns’ the frequency response of that noise, and then removes that ‘noise’ from everything else that passes through it. So, if you have, for example, a vocal recording made with a somewhat hissy preamp/mic combination, Brusfri ought to be able to clean things up a bit and ‘subtract’ the noise element from the whole recording.

The app is AU only under iOS… and desktop version are available in the popular plugin formats.

Sampling the ‘noise’ simply requires you to hold down the large ‘ear’ icon for a few seconds in a section of the audio (or while monitoring incoming audio) that should be silent (and just contains the noise). Once you let go of this button, the app than takes the noise profile and subtracts it from the signal. You get some control over how that’s done with the ATK-THRS-REL controls (which control how fast the noise reduction is applied when a real audio signal is present and how loud the ‘real’ signal has to be in order to ‘pass’ through the processor). You can also apply a little bit of post-processing EQ via the EDGE, HPF and HIGH controls. Rather nicely, the display shows the exact values of these controls as you make any adjustments.

Anyway, Brusfri is very easy to use and, providing the noise you wish to remove is both consistent in nature (a regular hum or a buzz), and providing it is relatively quiet compared to the actual sound you are trying to record (or have recorded), then the app does a very respectable job without obvious ‘damage’ to the sound being repaired. That you can get this quality of noise reduction from such an inexpensive bit of software is really rather impressive.

It will be interesting to see if Klevgränd follow up this release with a similar app/plugin aimed at click, pop and crackle removal. This kind of audio restoration requires a different sort of processing algorithm but can also be very useful…..  Watch this space.

The launch price is 33% off what will be the eventual full price of the app for a short period. If you find yourself battling the occasional noise problem because of noisy equipment, microphone preamps that are not of the highest quality, or simply because you do location recording in less than ideal circumstances, Brusfri might be well worth having to hand in your iOS app toolkit. Check out the demo video below and then hit the download button to find out more via the App Store.


Download from iTunes App Store

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