For sheer excitement, try a midi harpsichord toccata on for size. Vivienne Spiteri, harpsichordist extraordinaire, has produced a phenomenal disc of aggressive and insightful new electroacoustic music for an old instrument. For fans of mechanistic music, David Keane’s Turbo Toccata will be a sure hit. Others will find fulfillment in the classicism of Bruce Pennycook’s “The Desert Speaks.” The harpsichord has always lent itself to virtuosity, and Spiteri capitalizes on this: The energy level is high on this disk — the tension never lets up. One highlight is the amplified breathing down your neck of the hair-raising “jardin secret ii,” (secret garden ii) for tape and harpsichord, by Kaija Saariaho. As the liner note says, “au diable le conformisme!” (To hell with conformity!).