RD3 - Groovebox is an Android application developed by mikrosonic that allows users to create their own grooves and drum loops. With this app, you can turn your Android phone or tablet into a musical instrument and make your own electronic music tracks.

The app features two virtual analog synthesizers that resemble the legendary 303 synthesizer. It also includes a drum machine with 10 different drum kits, including popular ones like 808 and 909. RD3 - Groovebox offers a variety of audio effects such as reverb, distortion, filter, phaser, and delay, which can be controlled in real-time.

One of the standout features of RD3 - Groovebox is its user-friendly interface. The app is multi-touch enabled, making it easy to create unique loops and manipulate them with resonant filters and effects on the go. Whether you're an experienced musician or a novice, RD3 - Groovebox is suitable for all skill levels.

RD3 - Groovebox is optimized for Android phones and tablets. It supports live performances in landscape mode on phones and 7-inch tablets, and offers a special rack view for 10-inch tablets in portrait mode. Additionally, loops created with the Groovebox can be integrated into mikrosonic's audio mixer app SPC - Music Sketchpad.

Overall, RD3 - Groovebox is a pioneering audio app that empowers users to unleash their creativity and create their own music. With its intuitive interface and versatile features, it's a must-have for anyone interested in electronic music production.