The player calls this function when the equalizer settings have changed.

If the plug-in implements an audio equalizer it needs to handle this call. If the plug-in does not implement an audio equalizer it must set this function pointer to NULL. This will cause the player to use alternate equalizers if available. Any change to the state of the equalizer will cause the player to call this function. The current values for the equalizer will be in the eqInfo parameter.