Abstract: A sound production control apparatus has a position detector that detects, in accordance with a playing operation of a musical instrument, a position of a key displaceable within a movement range from a start position to an end position. The movement range includes a sounding range including a sounding position and a setting range that is closer to the start position than the sounding range. The apparatus causes a played sound associated with the key to be produced upon the detected position of the key reaching the sounding position, while controlling a characteristic of the played sound depending on a displacement characteristic of the key within the setting range before the key is positioned in the sounding range.

Abstract: A method is designed for determining optimum power values of optical beams emitted from a plurality of optical pickups provided in an optical disk recording apparatus. In the method, a first step is performed for performing test recording of data by use of the plurality of the optical pickups, respectively, such that each optical pickup is operated to irradiate an optical beam onto the optical disk for recording data on a test area of the optical disk. A second step is performed for reproducing respective data recorded in the test area by the respective optical pickups, by use of a predetermined one of the plurality of the optical pickups. A third step is performed for judging ? values from the respective data reproduced from the test area. A fourth step is performed for determining, from the judged ? values, the optimum power values of the optical beams for the respective optical pickups.

Abstract: A method is designed for determining optimum power values of optical beams emitted from a plurality of optical pickups provided in an optical disk recording apparatus. In the method, a first step is performed for performing test recording of data by use of the plurality of the optical pickups, respectively, such that each optical pickup is operated to irradiate an optical beam onto the optical disk for recording data on a test area of the optical disk. A second step is performed for reproducing respective data recorded in the test area by the respective optical pickups, by use of a predetermined one of the plurality of the optical pickups. A third step is performed for judging ? values from the respective data reproduced from the test area. A fourth step is performed for determining, from the judged ? values, the optimum power values of the optical beams for the respective optical pickups.