SYNTH SENSE Dream Theater’s Jordan Rudess lets you in on the secrets to making your synthesizer sounds soar  If you’ve listened to pop music created since the 1960s, there’s little doubt you’ve heard synthesizers at work. Innovators have been trying since the 1800s to create devices to replicate sounds otherwise unavailable to the layman, but it was only in the last four decades that the synthesizer became thought of as an instrument in...