Complex sentence: Dry radio sweepers are voice only--no music or sound effects--whereas wet sweepers are generally containing sound FX or otherwise known as Sonic, which is a global term for all sound effects and elements used in a sweeper.
Split into simpler sentences: Dry radio sweepers are voice only--no music or sound effects. Whereas wet sweepers are generally containing sound FX or otherwise known as Sonic, which is a global term for all sound effects and elements used in a sweeper.