Yamaha SMAF

Yamaha Synthetic Music mobile Application Format, also known as SMAF, refers to the .mmf file format for SMAF songs and the synthesizer chips that support the format.

MMF File format
All MMF files have a header of  in hex or "MMMD " in ASCII.

SCAS
Synchronous Contents Authoring System, or SCAS, is a specification within SMAF that allows animated sprites and text to be shown with music in SMAF ringtones. It was intended to be used as a format for "animated" ringtones (PMD files can also do this, as seen on the Sanyo Katana) as well as for MMS and email greetings.

Currently, the only phones known to have SCAS content are various Anycall phones (SGH-X808, for example). The Anycall brand is exclusive to South Korea, China, Hong Kong, and Taiwan. Such phones rarely turn up anywhere else as a result.