The Denoiser is really useful for removing the top layer of noise that occurs with any recording. One pass through the Denoiser at the default noise reduction settings often reveals whispers, low voices and other sounds not heard before applying the reduction. One caution however. Noise reduction, while clarifying the original message and revealing new ones can also tend to change the pitch of the original voice and even alter the words of the original message beyond recognition. As long as the original clip is available for comparison, this will not be an issue since the reduction can be reapplied to achieve the necessary balance between clarity and the original intent of the message.