I play a lot of Rush, so Ive spent some time trying to emulate Geddys tone, and I can get part way there with the right bass and the right amp settings, but as we all know, tone is in the hands. Part of Geddys tone comes from his flamenco technique, hitting the strings with a back and forth motion of his fingers. It effects not only his tone, but his phrasing as well. Try as I might I just cant do it. However, I can get pretty close using a pick. Up until recently, I had been using a Dunlop Nylon 1 mm, its pretty firm for a nylon, but still somewhat flexible, I thought it was a pretty good approximation of digging in with ones fingers and I can get the effect of the back and forth motion on the strings. I recently read in another thread, about [Invalid or Expired Link Removed], they are made from Graphite enriched Delrin, they are very stiff, and have a hardness somewhere between Nylon and Delrin. I ordered some to give a try, not even thinking that I would use them for Rush, but to my surprise, they get me closer to Geddys tone than anything else Ive tried! Are Geddys finger impregnated with graphite? Has 45+ years of playing, calloused his fingers, so much, that they are as hard as graphite? I like to shake his hand some day and find out 
