Larson-Davis 1/2- inch calibration microphone, Quest sound level meter, 2 Etymotic Research DPOAE probe assemblies, Yamaha MIDI-compatible keyboard, Tascam four- track tape recorder, JBL sound system, Marshall amplifier, and Les Paul electric guitar, and Grass oscilloscopes. Offices and labs are equippe

. But there were already hints of the change to come, of the evolutions in music technology that would eventually compete with the guitar. In 1979, Tascam's Portastudio 144 arrived on the market, allowing anybody with a microphone and a patch cord to record with multiple tracks. (Bruce Springsteen used