More coolness: notice Scotty working the transporter controls. They made sure each sound effect coincided with his pressing of a button. This might not seem like a big deal, but consider that these same sound effects would often trail on after a character hit one button. As an example, check out the opening scene when Kirk says "bring it aboard." Scotty has five button hits, with a sound for each one. Later episodes would have that same five-note sound effect after one push of a button. It's almost like Scotty is playing a musical instrument.