Sonic the Hedgehog CD (1993) occupies a unique position in video game audio history, released during the transition from pure FM synthesis to hybrid streaming audio. Unlike its Genesis/Mega Drive predecessors, Sonic CD utilized a custom soundfont approach driven by the Sega CD’s Ricoh RF5C164 chip combined with CD-DA (Red Book) audio. This paper analyzes the structural components of the Sonic CD soundfont, differentiating between its sampled PCM percussion/bass and its iconic FM leads, and explores how its "soundfont" design philosophy influenced both the Japanese and US/EU soundtrack aesthetics.