Klevgrand Brusfri Noise Reducer User Manual

1. Product Overview

Klevgrand Brusfri is an advanced audio noise reduction plugin designed with a simple and intuitive user interface. It is optimized for cleaning up noisy audio recordings while preserving sound quality. Unlike many other noise reducers that access the audio's phase to suppress noise (which often introduces unwanted monitoring side effects), Brusfri uses multiple finely tuned gates to mute unwanted noise.

This approach ensures that the intended sound remains intact without phase alterations, providing a clean and natural result. Brusfri is ideal for various audio applications, from music production to podcasting and voiceover work, where pristine audio is paramount.

Figure 1: Overview of the Klevgrand Brusfri user interface, showing the main controls and visual feedback.

2. Setup and Installation

Brusfri is a software plugin and requires installation on your computer. Please ensure your system meets the minimum requirements before proceeding.

2.1 System Requirements

• Compatible Operating System (e.g., Windows, macOS)
• Supported Digital Audio Workstation (DAW) or host application
• Sufficient RAM and Processor speed for audio processing
• Available disk space for installation

2.2 Installation Steps

1. Download the Brusfri installer from the official Klevgrand website.
2. Locate the downloaded installer file (e.g., .exe for Windows, .dmg for macOS).
3. Double-click the installer and follow the on-screen instructions.
4. Ensure you select the correct plugin formats (e.g., VST, AU, AAX) compatible with your DAW.
5. Once installation is complete, launch your DAW.
6. Scan for new plugins within your DAW's preferences or plugin manager. Brusfri should now appear in your list of available plugins.

For detailed and up-to-date installation instructions, always refer to the official Klevgrand documentation or website.

3. Operating Instructions

Brusfri's intuitive interface makes noise reduction straightforward. The primary goal is to "teach" the plugin what the noise sounds like, allowing it to effectively remove it from your audio.

Figure 2: Klevgrand Brusfri user interface highlighting key operational controls.

3.1 Key Controls and Functions

• 1. Attack-Threshold-Release Parameters:

  These parameters collectively control all internal expanders. Adjusting these sliders (visible in Figure 2, labeled '1') allows you to fine-tune how aggressively Brusfri reacts to and suppresses noise. The visual graph provides feedback on the current gating behavior. Experiment with these to find the optimal balance between noise reduction and preserving desired audio.

• 2. Learn Button:

  (Visible in Figure 2, labeled '2') This is a crucial step. To analyze the noise, Brusfri requires a sample of the noise itself. Press and hold this button while playing a section of your audio that contains only the noise you wish to remove (e.g., room tone, hum, hiss, fan noise). Brusfri will analyze this audio data and create a noise profile. It is imperative to perform this step for effective noise reduction.

• 3. Tonality Controls (Smooth, SC HPF, Treble):

  (Visible in Figure 2, labeled '3') While Brusfri typically generates an accurate noise profile automatically, sometimes adjustments are needed, especially with significant noise. These controls allow for fine-tuning the character of the noise reduction:

  • Smooth: Adjusts the smoothness of the noise reduction process, potentially reducing artifacts.
  • SC HPF (Sidechain High-Pass Filter): Filters the sidechain signal, which can help Brusfri focus on specific frequency ranges of the noise.
  • Treble: Provides additional control over the high-frequency components of the noise reduction.
• Gain and Mix Controls:

  These standard controls allow you to adjust the overall output level (Gain) and blend the processed signal with the original (Mix), giving you flexibility in how much noise reduction is applied to the final output.

3.2 Workflow Summary

1. Insert Brusfri as an effect plugin on the audio track you wish to clean.
2. Locate a section of your audio that contains only the unwanted noise (no desired signal).
3. Press and hold the "Learn" button while playing this noise-only section. Release the button once the noise profile is captured.
4. Play back your full audio. Adjust the Attack-Threshold-Release parameters to achieve the desired noise reduction.
5. If necessary, use the Tonality controls (Smooth, SC HPF, Treble) to refine the sound and minimize any remaining artifacts.
6. Adjust Gain and Mix to integrate the processed audio into your project.

4. Maintenance

As a software plugin, Brusfri requires minimal physical maintenance. However, regular software maintenance is recommended to ensure optimal performance and compatibility.

• Software Updates: Periodically check the official Klevgrand website for software updates. Updates often include bug fixes, performance improvements, and compatibility enhancements with new operating systems or DAWs.
• System Optimization: Ensure your operating system and DAW are up-to-date. Keep your computer's drivers (especially audio drivers) current.
• Disk Space: Ensure sufficient free disk space on your system drive for smooth operation of your DAW and plugins.
• Backup: Regularly back up your project files and system to prevent data loss.

5. Troubleshooting

If you encounter issues with Brusfri, consider the following common troubleshooting steps:

• Plugin Not Appearing in DAW:
  • Ensure Brusfri was installed to the correct plugin folder for your DAW.
  • Perform a plugin rescan within your DAW's preferences.
  • Verify that your DAW supports the installed plugin format (VST, AU, AAX).
  • Check if your operating system or DAW version is compatible with Brusfri.
• Poor Noise Reduction Quality:
  • Ensure the "Learn" process was performed correctly on a section containing only noise.
  • Experiment with the Attack-Threshold-Release parameters.
  • Adjust the Tonality controls (Smooth, SC HPF, Treble) to refine the sound.
  • Try capturing a new noise profile if the noise characteristics have changed.
• Audio Artifacts or Warbling:
  • This can occur if the noise reduction is too aggressive. Reduce the intensity of the noise reduction.
  • Adjust the "Smooth" parameter to soften the processing.
  • Ensure the "Learn" phase was accurate and did not include desired audio.
• Performance Issues (Clicks, Pops, Lag):
  • Increase your DAW's audio buffer size.
  • Close other demanding applications.
  • Ensure your computer meets the recommended system requirements.
  • Update your audio interface drivers.

If problems persist, consult the official Klevgrand support resources or contact their customer service.

6. Specifications

Note: Specific system requirements (OS versions, DAW compatibility) are subject to change. Always refer to the official Klevgrand website for the most current specifications.

7. Warranty and Support

For information regarding product warranty, technical support, and customer service, please refer to the official Klevgrand website or the documentation provided with your software purchase.

Official Klevgrand Website: www.klevgrand.se

Support resources typically include FAQs, knowledge bases, and contact forms for direct assistance.