Dunno what his set up was but you can rig an Airzound so you can brake and sound the horn at the same time.
I stand corrected, I'd only seen them as handlebar 'add-ons' that wouldn't lend themselves that well to simultaneous braking before!
@SwissChap started
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Dunno what his set up was but you can rig an Airzound so you can brake and sound the horn at the same time.