Adobe 22011292 User Guide - Page 120

106 CHAPTER 8 Effects Menu - Edit View Dynamics Processing dialog - Attack/Release tab Gain Processor The Gain Processor amplifies or attenuates the signal depending on the amplitude detected. Here are its components: • Output Gain is a gain applied to the output signal. It's the last step performed on the audio. • Attack Time is 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 "this much time" before the output actually drops to its corresponding volume level. • Release Time is 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. Note: If the sum of Attack and Release times is too short (less than about 20 milliseconds total), audible effects, such as a "vibrating" sound, can be heard at around 1000Hz/ms total. For example, if the Attack and Release times are each set to 5 ms (making 10 ms total), then a vibrating sound at 100Hz can be heard. Thus, a total value of about 30 ms is about as low as you can go without introducing these effects. • Joint Channels In stereo, each channel can be compressed independently, sometimes causing the surrounding background noise to get louder on one channel at a time. This can sound strange. For example, a loud drum beat 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 are amplified together by the same amount (thus preserving the stereo center-channel image). For instance, a loud drum beat on the left channel will also cause the right channel to be reduced in level by an equal amount.