 Jacob brought a rock music esthetic to the theatre for the first time, adding more loudspeakers for more volume, and he used more microphones in fixed locations, more band and singing microphones, and one of the early VHF wireless microphones by Edcor used on a few songs.Lighting designer Jules Fisher said the improvement to the sound quality was immediately apparent.With this success in Boston, Fisher and Jacob were sent to other cities to assist in the mounting of new productions of "Hair", including overseas travel to Europe where they helped local lighting and sound crews attain similar results, modernizing musical theatre in the process.