The Fender Fatfinger Bass Sustain Enhancer “Instantly add more sustain and awe-inspiring tone to you instrument with the Fender Fatfinger. By clamping the Fatfinger on the headstock of you instrument it will enhance the overall tone and note-to-note response of any electric or acoustic guitar or bass“, at least that’s what the packaging claims. But does it actually work? I picked one up recently to find out.