Tim Kaiser approaches music creation with a curious set of mental and inventive skills. At last year’s Homegrown, he performed to a standing-room only crowd where vertically challenged gawkers missed the visual half of the performance. Because Kaiser improvises music with custom-built gonkulations and acousto-electric contraptions, there is much to see and be amazed by. These solo instruments fill the air with sound frequencies and rhythms but have to be seen to be believed.