| 摘要 |
Tone generating processing is executed on an operating system having no full multitask function. The tone generating processing is activated a plurality of times, i.e., at a plurality of activating times, within each predetermined time period. Thus, even when the tone generating processing fails to be activated at some of the activating times, a predetermined number of samples of tone data can be belatedly formed within the predetermined time period, by tone data forming operations being effected only at the other activating times when the tone generating processing is actually activated. If the predetermined number of samples of tone data can not be formed, just by the tone data forming operations effected only when the tone generating processing is actually activated, for every tone generating channel assigned to the tone generating processing, the number of the tone generating channels to be used for forming the tone data is reduced so as to secure formation of the predetermined number of samples of tone data.
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