| 摘要 |
There is provided a musical tone control system for an electronic keyboard instrument, which is capable of calculating a key depression velocity of a key with high accuracy without being adversely affected by a large rotational resistance of the key during a let-off, and stopping sounding of a musical tone in appropriate timing. The musical tone control system 20 detects first key depression information S1 on a key 3 at a first position P1 corresponding to a key depression depth obtained before start of a let-off, second key depression information S2 on the key 3 at a second position P2 which corresponds to a larger key depression depth than the first position P1 does, and third key depression information S3, obtained after termination of the let-off, on the key at a third position P3 which corresponds to a larger key depression depth than the second position P2 does. The tone volume of a musical tone is set based on a key depression velocity V of the key 3 calculated based on two key depression information items corresponding to two key depression depths, between which the let-off does not occur, i.e. the first and second key depression information items or the second and third key depression information items. Further, sounding timing is set based on the third key depression information item, and sounding stop timing is set based on the first or second key depression information item which corresponds to a key depression depth obtained before a time point around the start of the let-off.
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