Electronic musical instrument, method of generating musical sounds, and storage medium

A method executed by an electronic musical instrument that includes:

• a first memory storing a plurality of waveform data;
• a second memory having a plurality of waveform buffer regions that respectively function as ring buffers;
• a processor that executes a transfer process of transferring the waveform data stored in the first memory to the waveform buffer regions in the second memory;
• and
• a sound source that executes a read process of reading waveform data from the plurality of waveform buffer regions in the second memory and causing a plurality of sounds to be generated simultaneously based on the waveform data read from the plurality of waveform buffer regions in the second memory, the transfer process by the processor and the read process by the sound source being executed in a ring buffer operational manner using the waveform buffer regions as ring buffers, respectively,
• the method comprising:
• causing one of the processor and the sound source to execute a threshold margin value setting process of setting a plurality of threshold margin values respectively for the plurality of waveform buffer regions, the plurality of threshold margin values being settable to values specific to the corresponding waveform buffer regions and at least some of the threshold margin values are different from each other;
• causing one of the processor and the sound source to execute an identification process of identifying, at a prescribed timing, among the plurality of waveform buffer regions, a waveform buffer region in which a waveform read margin calculated for said waveform buffer region reaches the threshold margin value set and assigned to said waveform buffer region, the waveform read margin being calculated for each waveform buffer region at the prescribed timing based on a transfer position in the waveform buffer region to which the processor is transferring waveform data from the first memory at the prescribed timing and a read position in the waveform buffer region from which the sound source is reading waveform data in the read processes;
• and
• causing one of the processor and the sound source to execute a sound generation stopping process of stopping a sound that has been generated from the waveform data read from the waveform buffer region that is identified by the identified process, thereby stopping the read process on the identified waveform buffer region by the sound source.

A computer-readable non-transitory storage medium having stored thereon a program to be executable by an electronic musical instrument that includes:

• a first memory storing a plurality of waveform data;
• a second memory having a plurality of waveform buffer regions that respectively function as ring buffers;
• a processor that executes a transfer process of transferring the waveform data stored in the first memory to the waveform buffer regions in the second memory;
• and
• a sound source that executes a read process of reading waveform data from the plurality of waveform buffer regions in the second memory and causing a plurality of sounds to be generated simultaneously based on the waveform data read from the plurality of waveform buffer regions in the second memory, the transfer process by the processor and the read process by the sound source being executed in a ring buffer operational manner using the waveform buffer regions as ring buffers, respectively,
• the program causing the electronic musical instrument to perform the following:
• causing one of the processor and the sound source to execute a threshold margin value setting process of setting a plurality of threshold margin values respectively for the plurality of waveform buffer regions, the plurality of threshold margin values being settable to values specific to the corresponding waveform buffer regions and at least some of the threshold margin values are different from each other;
• causing one of the processor and the sound source to execute an identification process of identifying, at a prescribed timing, among the plurality of waveform buffer regions, a waveform buffer region in which a waveform read margin calculated for said waveform buffer region reaches the threshold margin value set and assigned to said waveform buffer region, the waveform read margin being calculated for each waveform buffer region at the prescribed timing based on a transfer position in the waveform buffer region to which the processor is transferring waveform data from the first memory at the prescribed timing and a read position in the waveform buffer region from which the sound source is reading waveform data in the read processes;
• and
• causing one of the processor and the sound source to execute a sound generation stopping process of stopping a sound that has been generated from the waveform data read from the waveform buffer region that is identified by the identified process, thereby stopping the read process on the identified waveform buffer region by the sound source.