Born in Newark, raised in Irvington, with a home in Bradley Beach, Sam Edelston is blazing new trails when it comes to the fretted dulcimer, a string instrument related to the zither that’s played like a lap steel guitar. If you ask him, he’ll tell you his mission is to make the dulcimer as popular as the guitar in rock’n’roll. Joni Mitchell used to play it but Edelston, on his Making Waves debut, is the first artist to use it as a lead ax in a rock setting.