Computer instruments that process waveforms to produce sound effects, how these devices operate, and machine-readable media

摘要

The computer musical instrument of the present invention is provided with a program that is executed to perform reproduction of musical sounds by reading corresponding waveforms. The storage device is provided for storing a plurality of waveforms corresponding to different musical tones in which each waveform is stored in the form of a sequence of amplitude value data arranged at predetermined sampling periods. The tapping pad is provided for designating at least one of the stored waveforms to instruct the reproduction of the corresponding musical sound. The panel switch is operable by the user to switch the reproduction of the musical sound between the normal mode and the selection mode. The CPU is allocated with a relatively high function under normal mode to simultaneously read out the number of specified waveforms from the storage device in accordance with the program so as to simultaneously reproduce the corresponding number of musical notes. Otherwise, the CPU assigns a relatively low function under the selection mode to play back simultaneously under the selection mode, while additional functions are assigned under the selection mode to digitally process the waveform specified to give a scratch effect to the reproduced sound according to the program. The number of is reduced compared to that under normal mode. The scratch effect may be applied to a new waveform input in real time from an external input.