Some effects come with a series of options known as “Presets”. The idea behind presets is to save you having to fiddle around with the numbers, which is great if the numbers don’t mean a lot to you. Instead, you can just browse the preset list and select the option which best describes the effect you are trying to achieve.
To ‘amplify’ is to increase the loudness or volume of the selected region. To make a part of the recording softer or louder, select it and then use the menu Effects -> Amplify. The volume is entered in percent (100 being no change, 50 being -6dB softer or 200 being +6dB louder).
To ‘normalize’ is to adjust the volume so that the loudest peak is equal to (or a percentage of) the maximum signal that can be used in digital audio. Usually you normalize files to 100% as the last stage in production to make it the loudest possible without distortion.
You can use this function to create single echoes, as well as a number of other effects. Delays of 35 milliseconds (ms) or more will be perceived as discrete echoes, while those falling within the 35-15 ms range can be used to create a simple chorus or flanging effect. (These effects will not be as effective as the actual chorus or flanging effects, as the delay settings will be fixed and will not change over time).
Fade In/Fade Out
In audio engineering, a fade is a gradual increase or decrease in the level of an audio signal. A recorded sound may be gradually reduced to silence at its end (fade-out), or may gradually increase from silence at the beginning (fade-in).
Audio mixing is the process by which a multitude of recorded sounds are combined into one or more channels, most commonly two-channel stereo. In the process, the source signals’ level, frequency content, dynamics and panoramic position are manipulated and effects such as reverb may be added. This practical, aesthetic or otherwise creative treatment is done in order to produce a mix that is more appealing to listeners. You can choose to have both narration and background music played simultaneously.