Dr. Brad Meyer, Professor of Percussion at Stephen F. Austin State University, recorded the ATSSB Percussion Etudes for teachers and students to reference. If you would like to have Dr. Meyer do a virtual or in-person clinic at your school, or you have any questions, please feel free to contact him at meyerbe@sfasu.edu.
Robbie Green and Alex Tomlinson made the play-along tracks that are available at the bottom of the page.

Snare Drum: p. 52, #48 of Portaits in Rhythm by Cirone

Mallets: Page 90, XXXV from Modern School for Xylophone, Marimba, Vibraphone by Goldenberg

Timpani: p. 63, #60 from Modern Method for Tympani by Goodman