Adobe 22011292 User Guide - Page 201

ADOBE AUDITION 187 User Guide If the low precision mode is used, you can improve the quality of stretched mono-tonal (pure tone) samples by choosing a Splicing Frequency that's evenly divisible into the frequency of the sample. Use the Frequency Analysis window to find the sample's base frequency, then divide by an integer to get the Splicing Frequency. For example, if the tone was reported to be 438Hz, dividing by 20 gives 21.9Hz. Thus, using 21.9Hz as the Splicing Frequency will greatly improve the quality by reducing phase artifacts. For non-tonal or noisy samples, the Splicing Frequency doesn't matter as much. • Overlapping: When stretching or compressing, "chunks" of audio are overlapped with previously transformed chunks. This setting determines how much the current chunk will overlap with the previous and next ones. If you find you're getting a chorus effect when stretching, you can lower the overlapping percentage. However, doing so may produce a "choppy" sound. If so, adjust the overlapping value to strike a balance between choppiness and chorusing. Overlapping can be as high as about 400%, but you should only go this high for really high speed increases (like 200% or more). • Choose Appropriate Defaults: When preserving pitch or tempo, check this box to have Adobe Audition automatically select good default values for the Splicing Frequency and Overlapping settings. Presets Adobe Audition comes with several Stretch 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 Stretch 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. Refresh Effects List Select this item to scan your system for new Adobe Audition effects and DirectX plug-ins.