Brusfri vs ChannelStrip

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 can also be used as a AUv3 plug-in in compatible hosts, for example in GarageBand. *Brusfri means "Noise free" in Swedish. Here are some examples of sound conditions that Brusfri handles well: * Guitar amp * Noisy vintage gear * Boosted pre-amp * iPhone/iPad and external mic hiss * Room reverb removal * Fan noise * Background ambiance * Mains hum / Electric hum Usage In short, press “Learn” during a couple of seconds of isolated noise to create a "profile" for noise. This may be all you need to do. Brusfri can be used in two ways, either standalone or as a AUv3 plug-in. Standalone Import the audio, either by extracting audio from a video, by importing from iTunes, or by using the “Open In…” option in any other app that can export audio. Press and hold the Learn button (the ear) while playing unwanted noise. (It’s important that the Ear is only fed with isolated noise). When Learn is released, Brusfri will start reducing noise. AUv3 plug-in Open Brusfri in any AUv3 compatible host. Find a region in the recording that only contains noise and play it. Tap and hold the “LEARN” button for a short while (a second will be enough). When the LEARN button is released, Brusfri will start reducing noise. There are a bunch of parameters available that affect 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. LOOKAHEAD Makes transient processing a bit smoother. EDGE Controls the reduction aggressivity. A lower value gives a smoother reduction. HPF Reduces low frequencies. HIGH Compensates high frequencies by boosting them. MIX Mixes between dry and noise reduced signal. NOTE! Brusfri is CPU intensive and iPhone 6 / iPad AIR 2 or better is recommended. When used as an AUv3 plug-in, we highly recommend freezing/bouncing tracks to reduce CPU usage.

ChannelStrip is, as its name implies, a channel strip app and AUv3 plugin. With a gate, equalizer, and compressor, ChannelStrip can provide a solid and easy-to-use channel control for your iOS mixing needs. GATE: The gate is of our own design, and very smooth. With envelope that vary from nearly instantaneous to ludicrously long, you can use it for both basic noise control and more extreme tonal shaping. EQUALIZER: Modeled on the PEV, a famous German "cartridge" equalizer, the EQ in ChannelStrip is super useful for basic tone shaping. A very smooth and forgiving general-purpose EQ. COMPRESSOR: The compressor in ChannelStrip is, at its heart, our Rough Rider model. We removed all the filtering from Rough Rider to make it cleaner, and changed the times to be more appropriate to general mixing duties. I/O: ChannelStrip has positive gain on both the input and output, to get your levels right. It also has a bit of a personality on the output stage if you drive it hard (with either or both the input and output gains). Nominally very clean, it picks up a bit of dirt with high levels just like a hardware console. Along with that, both mute (which mutes the input entirely) and bypass (which sends the inputs right to the outputs without passing the DSP stages) are available as automatable parameters. In short, ChannelStrip is a general utility mixing tool, with a bit of character and a lot of usefulness. We _strongly_ recommend you use the AUv3 version. The standalone is provided as a courtesy, but ChannelStrip is designed as an AUv3 plugin, and prefers to be hosted in a DAW or modular host like GarageBand, AUM, Cubasis, nanoStudio, etc.