Sequencer

In a sequencer having operation modes comprising a music reproduction mode and a stop mode for controlling an external device for playing music, said sequencer employing alterable musical information items defining tempo and musical piece identification parameters for the music played by the device in said music reproduction mode, there being a given one of the musical information items most likely to be altered in conjunction with a given change in the operation mode of the device, the improvement comprising:

• display means for receiving and displaying said tempo and musical piece identification information items inputted thereto, said display means having multiple data input fields, each of said data input fields displaying one of said information items, said display means having indicating means for selectively indicating the data input field to which new data relating to an information item may be inputted and displayed;
• designating means for selecting a given operation mode of said sequencer;
• and
• control means coupled to said designating means for controlling the operation of the external device in accordance with the operation mode selected by said designating means, said control means having a play control means and a stop control means controlling the playing of music, said control means being coupled to said display means for causing said indicating means to indicate the data input field relating to tempo when said play control means is operated but the external device is not playing music and for preventing operation of said indicating means when the play control means is operated when the external device is playing music;
• and said control means causing said indicating means to indicate the data input field relating to musical piece identification when the stop control means is operated when the external device is playing music.