Adobe 22011292 User Guide - Page 199

ADOBE AUDITION 185 User Guide Quality Level Use this drop-down list to select the desired quality level. The higher quality levels will sound best, but will take longer to process. The lower quality levels have more unwanted harmonic distortion, but will process more quickly. Usually you won't notice any ill effects from harmonic distortion of the signal when using levels from Very Good on up. Aliasing will still occur however when pitch shifting up, but the higher quality levels will reduce the distortion effects tremendously when shifting the pitch down. Range This sets the vertical scale of the graph (the y-axis). The range can be set as semitones (there are 12 semitones to an octave) or as beats-per-minute. Each format will give a different rate of pitch change for a perfect diagonal line on the graph.In semitones format, the pitch changes logarithmically up and down, while in beats-per-minute format, the pitch changes up and down linearly. The number of semitones to shift up or down can be entered. If doing beats-per-minute, a range as well as the base tempo needs to be entered. You may specify the exact tempo of your piece to change to different rates, but this isn't required. Length Report At the bottom of the Pitch Bender dialog is a report of what the new length of the file will be. Keep in mind that when going down in pitch, it's easy to make very long files depending on how large a Range is selected. Presets Adobe Audition comes with several Pitch Bender presets. More information on presets can be found in the "Looking at the Work Area" chapter. Preview Press the Preview button to audition the current Pitch Bender setting before you apply it to the waveform. The selection is looped until you press the Stop button. Since Adobe Audition's Previews are dynamic, this gives you the opportunity to make and hear processing adjustments as the selection is continuously played. Stretch The Stretch effect changes the pitch (frequency) and/or tempo (duration) of the audio signal. It can also change either pitch or tempo without affecting the other. For example, you can use Stretch to transpose a song to a higher key, or to slow a passage down without changing the pitch. Pitch and tempo may also be varied over the length of the audio, giving the effect of slowing down and speeding up, or raising and lowering pitch. Stretch dialog Constant Stretch/Gliding Stretch Tabs To perform a constant stretch (no variation in the amount of stretch) on the entire selection, select the Constant Stretch tab. To vary the stretch from one level to another, choose the Gliding Stretch tab. With Gliding Stretch, you can choose the initial stretching percent (less than 100% will compress the wave), and the final stretching percent. Specifying separate values for start and end stretches the waveform in a linear fashion from one ratio to another. Initial/Final Sliders Adjust the desired slider to set the amount of stretch to be applied to the waveform. If you're using Gliding Stretch, sliders for both initial and final settings will be available. Changes in the sliders are reflected in each of the Ratio and Length boxes.