Also, passages can instantly be transposed to another key. Sequencers can also record and play back different parts of a composition in a multi-track manner. Therefore students can record a basic chord pattern, then listen to it while adding a melody line. Then these two parts can be played while a bass part is added, and so on. When the process is completed, the computer can then print out a complete score.
Sequencers are also helpful for professional musicians who are composers.
Another use for computers and keyboards for students is in individualized music instruction. For example, students can use the synthesizer to play a musical passage shown on the computer screen. Incorrect input is shown in musical notation next to the original passage, while both are played back for the student to compare. Similar programs are becoming available for other instruments besides keyboards. At least one software series currently on the market is designed especially for singing instruction.