Abstract: A performance data editing apparatus is realized by a computer system and/or an electronic musical instrument to provide rich expressions of an automatic performance by performing a variety of editing processes on performance data. Herein, the performance data correspond to multiple parts of the music played by the automatic performance, so at least one of the parts is designated as an editing part. For example, a velocity expander editing process is provided to broaden a distribution range of velocity data representing tone volumes of musical tones of the editing part. Thus, it is possible to emphasize ups and downs in variations of the tone volumes with respect to the editing part. A sound duplication editing process is provided to duplicate generation of a same musical tone under a condition where a shortage of tone-generation channels does not occur. Thus, it is possible to produce a marrowy and thick musical tone with respect to the editing part.

Abstract: A music system has a main system and a subsystem. The subsystem has a RAM which is capable of having waveform data read therefrom and written thereinto in a parallel manner. Waveform data are sequentially read from the RAM in an order in which the waveform data have been written into the RAM. Musical tones are synthesized based on the read waveform data. The main system has an external memory device storing waveform data, and determines packets into which waveform data to be transferred from the external memory device to the RAM for generation of musical tones is to be divided, based on a writing time period required for a unit data to be written into the first memory means and a reading time period required for the unit data to be read from the RAM. Waveform data are sequentially read from the external memory device in the determined packets. The read waveform data are sequentially written into the RAM at areas thereof from which previously stored waveform data have been read.