Roll your sleeves up. This is not a metaphor for hard work; literally roll your sleeves up. I was struggling with this, even on the 2nd time through. Turns out that the folded cuffs of my shirt were dragging on the bridge, muting the sound. It took me longer than it should have to diagnose the problem
Next time it’s just me, the bass, and a strategically placed tube sock, Chile Peppers style!