Audio effects
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You can modify any audio clip in your project using Studio’s plug-in audio effects, which are accessed with the Audio effects tool, the sixth tool in the Audio toolbox. The operation of this tool is identical to that of the Video effects tool. See that topic for a complete description.
As with video effects, your library of audio plug-ins is expandable. Any audio effect using the popular VST standard can be used in Studio just like effects supplied with the program.
In Timeline mode, any special effects you have applied to an audio or video clip are indicated by small icons along the bottom of the clip. These correspond to the categories shown by the Add new effect browser in the Audio effects and Video effects tools.
You can open the appropriate tool for parameter editing by double-clicking any of the icons.
In the illustration, the Noise reduction effect has been applied to both audio clips. The star icon below the video clip shows that one or more of the effects in the Fun category has been applied to it.
Effects can be copied and pasted between audio clips just as they can between video clips.
The powerful Noise Reduction filter is provided in all versions of Studio.
Studio Ultimate includes an extra group of audio effects. Full documentation of the parameters for the Ultimate effects is included in their context-sensitive on-line help which can be viewed by clicking the help button 
at the top left of the parameters panel for each effect, or by pressing the F1 key when the panel is open.
In a special category is the Speed effect, which operates on video and audio simultaneously.