Help improve it by adding in what you know, or look at the request below for specific details.
Perhaps you can help by uploading and adding a picture or two.
Rhythm Mixer is a Level 2 Command Style that can be used by Terra, Ventus, and Aqua in Kingdom Hearts Birth by Sleep Final Mix. It is activated by the use of Thunder-based, Surge-based, Mine-based, and Strike-based Deck Commands.
While using Rhythm Mixer, Terra, Ventus, and Aqua's attacks uses rhythmic sounds to attack enemies. The finisher consists of the character summoning a "music" set where they disappear into the ground and press either, or to attack enemies with sound as well. The final part of the finisher consists of the character appearing and causing a shockwave to damage enemies nearby.