I just got some hydrophone recordings done on most Fish Creek Spinner models. There's a different sound profile depending on whether the spinner has glass, plastic, or metal body beads. Also the blade types; Colorado, Inline, French, Indiana each influence the sounds recorded. If you've got a few minutes to spare, its kind of interesting. I can now understand more of why fish 'strike' at spinners.

http://www.fishcreekspinners.com/index_noise.html

Noise on the Line!