Sorry, that is something you’d need to troubleshoot further on your own. It could be that you aren’t instantiating it at the right point in the logical flow of the app, it could be that there is an issue in the logical flow of your app with where you are trying to initiate the vibration effect (similarly to with the original question in this topic) or it could be that soundMixing isn’t a fix for what you are trying to do. It isn’t a supported feature so regretfully there is a time issue for me with getting too deeply into exploring the different potential reasons it might not be working yet.