System/Library/PrivateFrameworks/ActionKit.framework

WFSetVolumeAction.h

NSObject
>
WFAction

@interface WFSetVolumeAction : WFAction

- (void)setMediaVolume:(float)a0;
- (void)runWithInput:(id)a0 error:(id *)a1;
- (id)subcategoryForCategory:(id)a0;
- (void)setRingtoneVolume:(float)a0;

@end