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It’s easy to set up side-chaining in Wwise using real time parameter control (RTPC) curves and the Wwise Meter Effect. The following example demonstrates how signals going through the PC Weapon Audio Bus will automatically compress the volume of the NPC Weapon audio bus in a three-step operation.
Create a Game Parameter: The first operation consists of creating a game parameter (i.e. PC_Weapon_Volume) and providing a range from -48 to 0, which represents a plausible dynamic range for a game. This game parameter will operate as a communication channel between the busses.
Insert a Wwise Meter Effect on a bus: The second step consists of inserting the Wwise Meter Effect on the bus whose audibility is to be ensured, in this case, the PC_Weapon, and selecting the output game parameter.
The Wwise Meter Effect monitors the input audio signal. When the Effect is used for side-chaining, the Mode, Attack, Release, and Hold parameters are used to slow down the response speed of the output signal and to send smoothed values to a game parameter, in this case, to the PC_Weapon_Volume.
Create an RTPC curve: The third and final step consists of creating an RTPC curve on the bus to be attenuated. In this example, the bus volume is attached to the PC_Weapon_Volume game parameter and then an attenuation curve is created. The "x" axis represents the calculated RMS signal from the Wwise Meter Effect, and the "y" axis represents how much the volume of the NPC Weapon Audio Bus will be attenuated.
To build a hierarchy of busses using side-chaining, simply repeat these three simple steps.