Application Tips 

• For the best results, record your own noise profile for every piece you denoise. Choose a portion of the recording that does not contain any material you want to recover, only noise you intend to remove. If the audio piece to be processed contains more only-noise parts, try to record a few noise profiles and test them to determine the one that works best.
• If the part containing only the noise signal is very short (under 2 seconds), we recommend setting up a loop for repetitive playback before recording a noise profile (see PlugIn Station help).
• If you cannot find in your entire recording any noise-only piece, use pre-defined profiles and modify them with cut freq and cut gain parameters, or try to record a user noise profile from a low-level part of the signal (hopefully with pauses in the useful signal). Finally, look for the careful adjustment of the parameters threshold and reduction
• Very strongly changing noise level and noise characteristic may be problematic. In such cases professional mastering engineers try to cut the original piece in parts and treat them individually with different denoising parameters. Later the denoised pieces are joined together.
• Do not exaggerate the parameters threshold and reduction to avoid artifacts occurring in the form of singing or robot-like sounds (time aliasing). Begin with a moderate adjustment by setting the noise profile to just above the background noise level (approx. 10 dB) and gradually increasing the reduction parameter. Finally try to recursively find the best relation between these two parameters. Do not forget to correctly set up the time and frequency resolution as mentioned in the DSP Quality window.
• If you are working on heavily disturbed material, find a good acoustical compromise between the level of remaining noise and artifacts introduced to the output signal. Be indulgent if you have hopelessly noisy material. Nobody can restore the original signal without having enough original information.
• It helps sometimes to apply the denoising process two or more times consecutively with a moderate parameter setting rather than one pass with an extreme setup.
• A recommended tool that significantly helps to adjust the DeNoiser parameter is the Analyzer PlugIn. It allows for following the denoising process, especially the influence of the noise profile and parameter settings.
• For the best results use your own ears in connection with the difference feature of the PlugIn Station. Switch between the original input signal and the input/output difference, i.e. the portion of signal removed by the denoising algorithm. This differential signal normally should not contain any parts of the original signal you want to preserve. 

Important Remark:
The DeNoiser PlugIn is a very fast and very effective tool. You will be amazed at how dramatic the audio quality of noisy recordings can be improved. But please do not expect miracles if you process material containing so much noise that the original signal is no longer distinguishable. The information theory says that once the information is sunk in noise (bad signal-to-noise ratio) and there is not enough information about the properties of the original signal, or even worse, the original signal is non-linearly distorted, the denoising process can deliver only limited-quality results.