fixing 'off' case where Emitter is mixed into the class
fixing 'off' case where Emitter is mixed into the class

Tonejs/Tone.js,TONEnoTONE/Tone.js,BlokDust/Tone.js,BlokDust/Tone.js,lukephills/Tone.js,TONEnoTONE/Tone.js,lukephills/Tone.js,Tonejs/Tone.js