After making headlines with the high-priced OP-1 Field and TX-6 mini mixer, Teenage Engineering’s next move is to release a free music-making app for Google phones - Pocket Operator for Pixel.

I lack musical talent. I don’t have rhythm, melody, or a grasp of theory. I like music, though, including chiptunes and other electronic music. I’ve thrown myself at (and immediately bounced off) ...