The series used sound effects from mostly Hanna-Barbera, Warner Bros., and Cartoon Trax Volume 1 (the latter library is more frequently used in episodes collaborating with composer Vivek Maddala than episodes without Vivek Maddala), as well as The Producer's Sound Effects Library, Cartoon Trax Volume 2, The Premiere Edition Volume 1, Series 2000, The General Series 6000, Series 4000, Animal Trax, Series 1000, Audience Reactions I, Signature Series - Peter Michael Sullivan, Classic TV, The International, Universal Studios and Rocky and Bullwinkle. Custom sound effects by Advantage Audio, Skywalker Sound, and Joel Valentine are also used, while some MGM sound effects (either on Sony Pictures Sound Effects Library Volumes 1-5 or otherwise not on any professional sound effects library) are occasionally heard and vary depending on the sound service and/or maybe the music composers.