Don MacRostie is the master of many things. In addition to being a fine mandolin builder, Don has continued to embrace new technologies that allow him to make better instruments. Dan Erlewine went down to Don's farm to help us get the most out of our interview with him.  Don's gone a step further than any other home-shop builder I know. He's put together a torrefying oven to age his wood in order to give it the best possible tone.