Disclaimer: The Sound Realm is not an official realm but theorized to be one of the 4 mystery symbols.
HW Sound Realm

Sound Realm: The Sound track is constantly shifting, and enveloped in near-total darkness. Drivers will need to keep their windows down and strain their ears over the roar of their engines to hear the track itself, or else risk slamming head-first into a wall.

Sound Realm Accelecharger "Sound Modulator": This Accele-Charger amplifies sounds the driver needs to be aware of while silencing extraneous sounds, thus rendering sound-based hazards ineffective.

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