Soundbreaker is the combined form of the five transformers, including Nightbird, Skywarp, Soundwave, Starscream and Thundercracker.
Little is known about Modulus. As the highest ranking member of the combiner, Starscream is technically the leader, although Soundwave is the torso of the combiner. With Starscream as an arm Modulus may have a Null Fist attack, or with Starscream as a leg he can leap 5 miles, as mentioned in Starscream's biography.
Soundbreaker was never released as a set, but could be created by combining the Generations Combiner Wars toys.
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