In other cases, special sensors were attached to the computer so that the computer could measure musical events such as the vibration of a clarinet reed, the fingerings of brass players, the gestures of a conductor, or the bow position, velocity, and pressure of violinists. Computers were also used to perform statistical analyses of collected data. Some working models of these systems were built. Different dictionaries could be used for different musical styles. Other studies examined technical issues related to MIDI and to musical representation on the computer.
Some studies describe technical algorithms for sound synthesis and sampling.
Some studies addressed issues related to music notation such as the difficulty of producing musical symbols on the computer screen or the representation of pitch in a format which computers could understand. Some studies proposed the expansion of notational practice to include effects not possible in common music notation and suggested systems for doing so. One study examined the problem of scanning a piece of music into the computer and converting it into a score or standard MIDI file. Studies generally indicate that computer use by music teachers is only beginning. Another common finding is that student attitude toward CAI is generally positive.