Adobe 22011292 User Guide - Page 332

318 CHAPTER 18 Effects Menu - Multitrack View • Ctrl+Left-click each wave block you wish to process to give them focus. • Access the Envelope Follower from the Effects pull-down menu, the Effects toolbar, or the Effects section of the Organizer window. The following are the major components of the Enveloper Follower dialog: Analysis Wave Choose the waveform from which to "read" the amplitude envelope. Any waveform in the session window may be selected from this drop-down list. Process Wave Select the waveform containing the material to apply the amplitude to. Any waveform in the session window may be chosen from this drop-down list. Output To Choose the track to output the resulting waveform to. This entry defaults to the next available track. Gain Processor Set the following: • Output Gain: the gain (measured in dB) applied to the output signal. It's the last step performed on the audio. • Attack Time: the attack time (measured in milliseconds) applied just before output. Attack Time determines the time in milliseconds that it takes for the processed output signal to reach its specified output volume. If there's suddenly a quiet portion that drops 30dB, it will take the amount of time specified in this field before the output actually drops to its corresponding volume level. If the sum of the Attack and Release times is too short (less than 20 milliseconds total), audible effects (such as a "vibrating" sound) can be heard at around 1000 Hz/ms total. For example, if the Attack and Release times are each set to 5 milliseconds (making 10 milliseconds total), then a vibrating sound at 100Hz will be heard. Thus, a total value of about 30 milliseconds is about as low as you can go without introducing these effects. • Release Time: the release time (measured in milliseconds) applied just before output. Release Time is the time it takes the end of a previous output level to reach the specified output volume. For example, where the Attack is the time it takes for the start of a pulse to reach the desired output volume, the Release is the time it takes for the end of the pulse to reach the desired level. • Joint Channels: With stereo audio files, each channel can be compressed independently, sometimes causing the surrounding background noise to get louder on one channel at a time - which can sound strange. For instance, a loud drumbeat in the left channel will make the background noise sound louder in the right than in the left. If Joint Channels is checked, both channels are used to find a single input dB value, and both channels will be amplified to by the same amount, thus preserving the stereo center-channel image. This means a loud drumbeat on the left channel will also cause the right channel to be reduced in level by an equal amount. Level Detector Set the following: • Input Gain: the gain (measured in dB) added to the signal before it goes into the Level Detector (the section that detects the current level). This essentially "pushes" the graph up or down by the gain given.