Multipetting in VtubeStudio is done by sending the mouth data through different set of params than the normal pets. So in order to have your pet react to a specific type of audio you need configure the mouth parameters in VtubeStudio

AI Pets #

For ai pets, the parameters used are VoiceFrequencyAi and VoiceVolumeAi which correspond to mouth smile and mouth open on your pets model respectively. In order to set them you need to go to the pets config and set them as so

Soundboard pets #

For soundboard pets, the parameters used are VoiceFrequencyBoard and VoiceVolumeBoard which correspond to mouth smile and mouth open on your pets model respectively. In order to set them you need to go to the pets config and set them as so

Pet split not working? #

Make sure you have the pet split enabled, for more details you can check it on How to multipet