Audiosprint is a mode in Audiosurf 2. In this mode, the character is replaced by a runner running across a suspended track. Avoid the obstacles!
Jump: Hold UP or 1 to jump over blue obstacles.
Duck: Hold DOWN or 2 to duck, sliding under orange obstacles.
Go Crazy: Hold both buttons at a purple obstacle to Go Crazy. Your character will do a few somersaults until the end of the obstacle.