Most vehicles have some sort of horn to alert other drivers, but why do semi trucks have huge, loud air horns? Turns out, there's a very good reason.

The effects don't require programming skills, since the sound board lets you drag and drop sound effects via USB. You can head here for full instructions.

A NASA engineer has revealed how you can make your car horn sound friendly instead of an angry honk that just annoys other drivers. YouTube star Mark Rober took to his channel, which has 28million … ...