Wiardgroup

And, in the 1970s, I wrote a short 
> article in "Electronotes" on using a slinky as a reverb/sound 
> modifier [I must have been less anal as a kid.  :-) ].

So, YOUR the guy. Gosh, I built a lot of slinky reverbs over the 
years because of that article.

Here is what you hath wrought...

http://www.musicsynthesizer.com/DIY/Grant/Spring%20Thing/Th
e%20Spring%20Thing.html

Remember, you started it! Also the reverb time is noted as 275 
milliseconds, that should be 2.75 seconds.

Dougs use of little DC motors with the brushes removed as 
rotary pickups is nothing short of brilliant.