SEATTLE — Learning an instrument for the first time is hard, but learning it a second time can be even harder! At least that’s the experience for Keith McKenzie of Lynden. “As a musician, the sound is your end result,” said McKenzie. “There were times when I just didn’t have the strength to hit the keys hard enough to get the sound.” For decades, McKenzie played the organ and piano at his church. But in 2021, he had a debilitating stroke that led to the loss of function of his left arm.