The 24 year old, who shot to fame as a child star in the family sitcom, quit acting in 2008 to concentrate on becoming a full-time race car driver.
But after several years competing at a professional level, Muniz has put his dream on hold to focus on another new project - he's signed up to play drums in upcoming rock band You Hang Up.
A statement on the band's MySpace.com page reveals the star has become a full-time member and will be dedicating his time to making the group a success.
The message reads, "Frankie moved to Arizona in 2008 to take a break from acting and pursue a professional career in racing, but has now become a permanent fixture of You Hang Up. Between Frankie's incredible drumming skills and his passion for music in general, he adds a flavour to You Hang Up that could not blend better with the group. Even though You Hang Up has been in the making since 2007, things are just getting started for them so stay tuned."