 The pitch changes of lightsaber movement were produced by playing the basic lightsaber tone on a loudspeaker and recording it on a moving microphone, generating Doppler shift to mimic a moving sound source.Lightsabers were present in the earliest drafts as mundane plasma weapons that were used alongside laser guns.The introduction of the Force in a later revision made the Jedi and the Sith supernaturally skilled; initially they were only portrayed as swordsmen.