LONG BEFORE the Midwest was overrun with groups who survived for years without hit records by playing interminable guitar solos to vacant-eyed kids at an endless succession of concerts and festivals, the Amboy Dukes had already made their mark. As part of the second generation scene that developed in Detroit, they played the Grande and all the other hot spots, but they also toured widely and pleased audiences their willingness to "get it on" to such an extent that they have been in constant demand since 1966, and leader Ted Nugent has become a living legend.