Tired of tweaking the volume of your music player when you open a certain application? Hate to always need to lower your music player volume when you start up a game? Volumer is the app for you! Volumer allows you to create rules so that the volume of your music player automatically changes when you open or close an app. Features: - Change the volume of iTunes, Spotify and VOX (with more to come); - Unlimited set of rules; - Rules triggered by order; - Lightweight. All of this backed by an awesome customer support!