This dissertation presents four interactive audiovisual projects by Video Jack, a duo composed of Nuno N. Correia and André Carrilho. The projects are: Heat Seeker (2006), AVOL (2007), Master and Margarita (2009) and AV Clash (2010). The three last works have adopted an Interactive AudioVisual Objects (IAVO) approach, consisting of the integration of sound, audio visualization and graphical user interface into modular units. The projects have been developed with a crossmedia perspective, ranging from performance to installation and net art, and the study emphasizes the last area. The conclusions relate to audiovisual content, interaction design and user experience. The IAVO approach is presented as a path to create projects for integrated audiovisual art that are coherent, flexible, easy to use, playful and engaging to experience.