File Extension ST2 File Format SoundTrakker128 Tune ST2 stands for SoundTrakker128 Tune. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Tally of numbers in column Why and how to performance tune SQL Server 2005 BRMS - *USRMLB - *MEDCLS question.