[brennonbrimhall]

Sounds like a question better suited for the Q&A, if you're in need of clarification, but I think it's relatively easy to discern the meaning behind this rule.

For me, that rule boils down to distinguishing diagnostic beeping and a sound system on drivable chassis that competes with the venue's sound system and PA.

I would be asking myself whether or not it could possibly distract drivers and spectators, and be prepared to rip it out if an inspector disagrees with your answer.