Talk:Noise Reduction

=Archived material re functionality that is hidden or removed=
 * Attack & Release "hidden" in the 2.1.0 release version
 * Isolate not in the 2.1.0 release version
 * Spectral selection ability removed from Noise Reduction

Step 2 - Reduce the Noise (with full set of controls, some now hidden)

 * 1) Select the region of waveform which you want to reduce the noise in, then set the Noise Reduction parameters. This is often best done by trial and error, adjusting the sliders and using the Preview button to listen to a few seconds of audio after noise reduction. Listening to the Residue can also be useful in determining how much damage is being done to the desired (non-noise) sound.
 * 2) Click Effect > Noise Reduction :
 * 3) *Noise Reduction (dB): Controls the amount of volume reduction to be applied to the noise. Use the lowest value that reduces the noise to an acceptable level. Higher values than necessary may make the noise even quieter, but will result in damage to the audio that remains.
 * 4) *Sensitivity: Controls how much of the audio will be considered as noise. Greater sensitivity means that more noise will be removed, possibly at the expense of some damage to the desired signal. Set this to the lowest value that achieves effective noise removal without the introduction of musical noise.
 * 5) *Attack time (secs): How quickly noise removal reacts to the onset of sound that is above the noise threshold. Values greater than 0.02 sec. are rarely needed or useful. A setting of 0 often works best.
 * 6) *Release time (secs): How quickly noise removal reduces its action after a loud sound ends. A range of 0.1 to 0.2 sec. corresponds to the generally-accepted times for temporal masking. Longer times may work better if your audio has a slow fade-out.
 * 7) *Frequency Smoothing (Hz): This control should be left a 0 except in extraordinary circumstances. If you are still hearing musical noise in the noise-reduced audio, and you have set the Sensitivity as high as possible without damaging the desired audio, try setting this control to a value between 25 and 100.
 * 8) *Noise:
 * 9) **Reduce: Select this option to filter out the noise from the selection.
 * 10) **Isolate: Select this option to keep the noise, making it more prominent by reducing the other sounds in the selection.
 * 11) **Residue: Select this option to hear the sound that is filtered out. This is useful for finding the optimum settings that do not damage the audio. If you can hear recognizable bits of the desired sound in the residue, it is likely that you have set Noise Reduction too high or Sensitivity too low.