Sequoia Audio production, broadcasting and mastering par excellence.

Improve audio quality. And increase customer satisfaction.

Sometimes the most important thing isn't what you hear, but what you don't hear.

The powerful Spectral Cleaning feature in Sequoia lets you remove unwanted noise (e.g. ringing cell phones) from your recordings without affecting the rest of the frequency spectrum. Your listeners will be grateful.

Spectral Cleaning

Spectral Cleaning is especially useful for post-editing live recordings and interviews containing noises from moving chairs, cell phones and coughing. Using conventional filters and complicated crossfade editing usually takes a lot of time and often results in changes to the useful signal.

The spectrogramm display (time on the horizontal axis, frequency on the vertical axis and color-coded amplitude) as well as A/B testing options make it possible to accurately restore the desired signal. Audio disturbances can be easily selected for removal with the mouse. Elements that have gone missing from the original frequency spectrum are recalculated into the recording using interpolation or transitions from the surrounding useful signal.

Spectral Cleaning

Logarithmic display

This setting allows you to change the spectrum view from linear to logarithmic. It makes sense to use this option when working in low frequency ranges so that low frequencies are triggered higher up, yet still display the entire frequency spectrum.

Threshold range editing

With this setting, you can limit interpolation to certain amplitudes in the spectrum. This means certain notes can be removed from the spectrum without influencing background signals.

This range determines the volume window in which the set threshold can be interpolated. Quieter or louder signal components outside the area will not be affected.

Automatic click marker recognition

 To highlight special points, quickly jump between or delete markers in the spectrogram, use the so called "click marker" buttons in the Spectral Cleaning interface. You can set and delete new markers. Created click markers are marked with a "C" in the editing window's marker bar. The "Search clicks" button allows you to search the entire project for clicks and have them marked automatically so you can edit them as a group. You can set the sensitivity of the search using the corresponding knob.


Sequoia uses advanced adaptive filter technology to remove noise from recordings. Recordings made in environments with a high level of noise (e.g. air conditioning unit) tend to suffer from constant background noise and are often unusable as a result

Using so-called noise prints, the DeNoiser contained in Sequoia can remove disturbing elements with little to no effect on the audio signal itself. For example, you can select the noise print of an air conditioning unit and calculate the noisy signal in your audio material in real time, allowing you to restore one-of-a-kind recordings in no time at all.



The DeHisser is an additional noise removal tool which eliminates regular, low-level "white" noise, typically produced by recordings, microphone pre-amplifiers or transformers.

Unlike with the DeNoiser, a sample of the distortion is not required.


The De-clipper is a tool for removing clipping and distortions. Passages with clipping are recalculated, i.e. interpolated, based on the material immediately surrounding them.

The DeClipping algorithm is suitable for material with clearly audible clipping, e.g. distorted piano or vocals.

DeClicker / DeCrackler

The DeClicker removes crackling and individual clicking noises, which are typical on scratched records. The DeCrackler has been specifically developed to remove crackling noises from old records.

The signal display shows you the edited material as a continuous waveform or a spectrogram. In the display, you can see at which position the DeClicker and the DeCrackler have intervened.

DeClicker / DeCrackler

Brilliance enhancer

The Brilliance Enhancer can be used to compensate for sound leakage in the higher frequencies and restore brilliance to the audio material. In contrast to an equalizer, which only raises existing frequencies, the Brilliance Enhancer recalculates new overtones from the remaining signal and markedly refreshes the sound.

The Brilliance Enhancer is particularly effective when used as a mastering effect for pop and rock songs to increase transparency and brilliance.

Brilliance enhancer