For the New York Studio please use Sigma Sound Studios, New York.
Recording studio in Philadelphia, Pennsylvania founded by recording engineer Joe Tarsia in 1968.
It was one of the first studios in the United States to offer 24-track recording capacity
and the first anywhere to successfully employ console automation.
In 2003 the location has been sold to Mario Santoro, but kept the name of Sigma Sound Studios.
Ca. 7,000 tapes of the studio's tape library were donated to the Drexel University Audio Archive.
The studios had closed for business in 2014.
In 2015. the Sigma building was officially dedicated as a historic site by the City of Philadelphia
and, in 2020, it has been listed on the Philadelphia Register of Historic Places, protecting it from demolition.

Also credited as
- Sigma Sound Services
- Sigma Sound Studios, Philadelphia, Pa.