I was talking to a friend today who wants me to build one after he tried one.
I'm trying to get access to the one he used belonging to a friend. I've told him if he can get some pictures of the guts or let me take some, I'll get it on here and we'll be in business.
I'm not an expert by a long shot, but this picture looks to me like it might have some SMD shizzle going on:
http://xotic.us/effects/img/products/sld/SLD2.jpgEDIT: This one too:
http://bughakata.up.n.seesaa.net/bughakata/image/Xotic_SL_Drive_Dip.jpg?d=a0