Audiobus: Use your music apps together.

What is Audiobus?Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.

Download on the App Store

Audiobus is the app that makes the rest of your setup better.

Koen Heldens & BRA launch the KH-EQ1

Take your productions to the next level with the help of one of the most knowledgeable producers and mix engineers of the moment with the KH-EQ1!

Not only does this original semi-parametric EQ allow for detailed sound shaping, but it also fuels your creative abilities due to its highly musical functionality.


The KH-EQ1 is a semi-parametric 5-band EQ like no other. It features rich-sounding frequency band controls that allow you to add color to each band while encouraging creative sound shaping with its highly musical functionality.

The KH-EQ1 - the second part of the Koen Heldens signature series - is a professional studio EQ with a twist, which features harmonic per-band saturation and our innovative, stepless Mid<->Stereo<->Side router.

Each license includes custom presets created by Koen himself, giving you the professional studio experience you’ve been waiting for.

It is the perfect addition to any producer’s arsenal, and it’s the ideal tool for adding richness and creativity to your productions!


The KH-EQ1 features five fully controllable symmetrical frequency bands between 20Hz and 33kHz, with individual gain controls between -18dB and +18dB. Each band moves independently, allowing for maximum customization.

Add richness to your sound by adding harmonic distortion to each individual frequency band using the saturation dials. This allows for complete control over the distortion without compromising all other frequency bands - perfect for adding that authentic-sounding analog vibe to your productions!

With the Auto Listen function, the gain control automatically solos the changes applied to each band. This makes it much easier to stay in control during your EQing process.

This function allows for M/S cascades or surgical stereo equalization. The stereo input signal is decoded to the middle and side with the possibility of blending them with the original stereo input via the stepless control.

The user interfaces support high pixel density on both Windows and Mac OS systems, giving you the most enjoyable user experience on high DPI displays.

System Requirements

Minimum System Requirements (MAC)
SSE2 compatible processor (Intel Core CPU recommended)
1GB of RAM
Mac OSX 10.9 or newer
VST, AU or AAX compatible host (64bit)
Display resolution of 1280x1024 pixels or higher
Minimum System rRequirements (WINDOWS)
SSE2 compatible processor (Intel Core CPU recommended)
1GB of RAM
Windows 7 or newer
VST or AAX compatible host
Display resolution of 1280x1024 pixels or higher


The KH-EQ1 is the second part of the Koen Heldens Signature Series, following in the footsteps of the KH-COMP1 Signature Compressor, that has been vowed both by our valued customers and press. Koen Heldens is a multi-platinum selling, American Music Award, and Billboard Music Award-winning mixing engineer and producer, best known for working on the most streamed song in 24 hours with XXXTentacion, among other prominent names in the music industry, such as Trippie Redd, Missy Elliott, and Timbaland.

Koen is the expert when it comes to producing some of the best and most-streamed albums in the hip-hop genre - and while his experience and understanding of music production allow him to create and shape the emotional foundation of a song, he also has a deep understanding of the technical aspects and limitations of each plug-in he holds in his arsenal.

The collaboration between Koen and Black Rooster Audio quickly evolved into a fruitful creative partnership, resulting in a one-of-a-kind plug-in series that is up to the standards of one of the greatest producers of the moment. We are proud to have Koen use our plug-ins extensively in every mix and to have co-created this Signature Series with him.

Black Rooster Audio
Wuppertal, Germany

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