JP4329276B2 - Musical sound generator and musical sound generation processing program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a musical sound generating apparatus and a musical sound generating process program.
[0002]
[Prior art]
2. Description of the Related Art Musical sound generators such as electronic musical instruments in recent years are configured to provide rich musical sounds by simultaneously generating a plurality of sounding events. For this purpose, the sound generation means such as a sound source has a predetermined number of sound generation channels (also referred to as “voices”), and performs processing for assigning sound generation events to each sound generation channel by an assigner or the like. When a sounding event occurs due to MIDI data input, performance, etc., if all of the specified number of sounding channels are sounding, one sounding event is dumped first and forcibly muted. In general, assignment processing for securing a channel (also referred to as “truncation processing”), that is, assignment processing giving priority to later arrival is performed.
In this assignment process, it is necessary to select a sound generation channel to be muted under some condition. Conventionally, the following three selection methods have been adopted. In the first method, the sound signal that is sounding has the most advanced envelope step. The second method selects the musical sound signal having the lowest envelope level. The third method selects the oldest received MIDI data or the performance, for example, the oldest key press.
[0003]
[Problems to be solved by the invention]
However, in the above conventional technique, since the method of selecting the sound channel to be muted does not consider musical elements, for example, the main sound source part such as a melody part, the rhythm part, and the chord part with the same sound source means. When the accompaniment sounding parts such as the above are sounding at the same time, forcibly muting the sounding part of the main melody by the conventional selection method has a problem of unnaturally affecting the generated sound.
An object of the present invention is to prevent an unnatural influence on music even if an assigning process for forcibly muting a sounding event during sounding to secure a sounding channel is performed.
[0004]
[Means for Solving the Problems]
The musical sound generating device according to claim 1 has a first priority corresponding to each type of control event that gives a pitch change to a sounding event assigned to each sounding channel of a sounding means having a predetermined number of sounding channels. A storage means for storing a coefficient and a second priority coefficient corresponding to each step of the envelope of the sounding event; and a first value for storing a received value of the received control event when the control event is received. Storage means, a second storage means for storing the changed step when a change in the envelope step is detected, and a first storage stored in the storage means when a new pronunciation event occurs. priority factor, based on the second priority coefficient corresponding to the first storage stored received value and envelope of the attack step means, said A first calculation means for calculating a priority for the Do pronunciation event, the case received value is stored, or the modified step in the second storage means is stored in said first storing means If the first priority coefficient, a second priority corresponding to the first storage means to the stored received value and the second storage means the stored envelope steps stored in said storage means A second calculating means for calculating a priority for a sounding event being sounded based on a coefficient; and when a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, It is determined whether or not the lowest priority among the priorities of the respective sound generation channels calculated by the second calculation means is lower than the priority of the new sounding event calculated by the first calculation means. Determining means, and when the determining means determines that the lowest priority is lower than the priority of the new sounding event, the sounding event having the lowest priority is forcibly silenced and assigned to the sounding channel. And an assigning means for assigning the new pronunciation event.
[0005]
A musical sound generation processing program according to claim 2 is a musical sound generation processing program executed by a computer of the musical sound generation device (corresponding to the CPU 1 in FIG. 1 in the embodiment), and a predetermined number of tone generation channels. A first priority coefficient corresponding to each type of control event that gives a pitch change to the sounding event assigned to each sounding channel of the sounding means that shares a plurality of sounding parts, and each envelope of the sounding event A first storage step of storing a received value of the received control event when the control event is received by the computer of the musical sound generating device having storage means for storing the second priority coefficient corresponding to the step If, when a change of the step of the envelope is detected, the second to store the changed step If the storage step, a new sound event has occurred, the second corresponding to the first priority coefficient, said first storage stored received value and envelope of the attack step in step stored in said storage means A first calculation step of calculating a priority for the new sounding event based on the priority coefficient of the first and second received steps when the received value is stored in the first storing step; If the changed step is stored in, corresponding to the first priority coefficient, it said stored received value and the second storage envelope step stored in the step stored in said storage means A second calculating step of calculating a priority for a sounding event being sounded based on a second priority coefficient; and all of the predetermined number of sounding channels. When a new sounding event occurs when is in a sounding state, the lowest priority among the sounding channel priorities calculated in the second calculating step is calculated in the first calculating step. A determination step for determining whether or not the priority of the new pronunciation event is lower, and the lowest priority when the lowest priority is determined to be lower than the priority of the new pronunciation event by the determination step And assigning the new sound event to the sound channel by forcibly muting the sound event.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an embodiment of a musical sound generator according to the present invention. In the figure, a CPU 1 is connected to a ROM 3, a RAM 4, a keyboard 5, a switch unit 6, and a MIDI I / F (interface) 7 via a system bus 2. The CPU 1 constitutes a computer that executes a musical sound generation processing program stored in the ROM 3 on the RAM 4 as a work area.
[0008]
The keyboard 5 inputs musical sound data, which is a sounding event, according to the performance. The switch unit 6 inputs a switch for setting a performance mode such as keyboard performance or automatic performance, a switch for setting a tone color for each of a plurality of sounding parts, and setting and changing of a part offset value which is a priority for each sounding part. It consists of a switch, a switch for inputting the setting and change of the weight of the envelope step, and the like. The MIDI I / F 7 exchanges MIDI data including sound generation events and control data events between an external MIDI device and the musical tone generator. The CPU 1 is also connected to the tone generator LSI 8, and outputs tone pitch data, control data, and the like of sound generation events from the keyboard 5 and the MIDI I / F 7 to the tone generator LSI 8.
[0009]
The tone generator LSI 8 includes eight sound generation channels consisting of CH0 to CH7, and a plurality of sound generation parts are shared by the eight sound generation channels, and a musical sound signal of a sound generation event assigned to each sound generation channel can be generated simultaneously. it can. In addition, the tone generator LSI 8 includes a synthesizer that synthesizes musical sound signals of eight sound generation channels into, for example, a two-channel stereo musical sound signal. The synthesized musical tone signal output from the sound source LSI 8 is converted from a digital signal to an analog signal by the A / D 9, and subjected to filter processing and amplification processing in the output circuit 10 and is output from an external speaker.
[0010]
FIG. 2 shows a part of the area of the RAM 4, which includes an envelope parameter, a tone color parameter, a sound part parameter, and a sound channel parameter area. Although not shown in the figure, the RAM 4 is provided with various registers (data register, flag register, pointer register, etc.), and temporarily stores various information associated with the tone generation processing executed by the CPU 1. Remember me.
[0011]
In the envelope parameter, as shown in FIG. 3, a set value of priority weight (priority coefficient) is stored for each step of the envelope in the stop (mute), attack, decay, sustain, release, that is, ADSR system. . Also in the case of an envelope other than the ADSR system, a priority weight setting value is stored for each step.
In the timbre parameter area, as shown in FIG. 4, for each timbre (n) (for each timbre 0 and timbre 1 in this embodiment), the pitch bend (PB), vibrato (VB), and envelope step are performance factors. (ES) variable name (T PB [n], T VB [n], T ES [n]) is stored corresponding to the priority weight set value. Even with the same factor, the priority weight differs for each tone color.
[0012]
In the sound part parameter area, as shown in FIG. 5, the pitch bend (T) set in FIG. 4 is set according to the tone (n) set for each sound part (p). PB [n]), vibrato (T VB [n]), envelope step (T ES [n]) priority weight is P PB [p], P VB [p], P The part offset value stored in ES [p] and set or changed is P Stored in PO [p].
In the sound channel parameter area, as shown in FIG. 6, tone numbers assigned to each sound channel, that is, each voice (v), envelope step (V ES [v]), and a priority (V PR [v]) is stored.
[0013]
Next, the operation of the tone generation process in the tone generator of FIG. 1 will be described.
FIG. 7 is a main flowchart showing the operation of the musical tone generation process of the CPU 1. First, after predetermined initialization (step A1), switch processing (step A2), keyboard processing (step A3), MIDI processing (step A4), assignment processing (step A5), sound generation processing (step A6), and other processing (Step A7) is repeatedly executed.
Note that the assignment process in step A5 and the sound generation process in step A6 are continuous cooperative actions by the CPU 1 and the tone generator LSI 8, but are distinguished as two processes for convenience of explanation.
[0014]
FIG. 8 is a flow of the switch process in step A2 in FIG. The mode switch in the switch section is searched (step B1), and it is determined whether or not the current mode is the automatic performance mode (step B2). In the case of the automatic performance mode, input setting of MIDI data input via the MIDI I / F 7 is performed (step B3). If it is not the automatic performance mode but the manual performance mode, the performance data input by operating the keyboard 5 is set (step B4). After the setting of step B3 or B4, another switch search process is performed (step B5), and the process returns to the main flow of FIG. As described below, in this embodiment, the tone generation process in the automatic performance mode will be described.
[0015]
FIG. 9 is a flow of the MIDI processing in step A4 in the main flow. It is determined whether or not a MIDI event has been received (step C1). If it is received, it is determined whether or not the MIDI event is a new sounding event (step C2). If the event is a sounding event, the assign flag ASF is set to 1 (step C3), sounding event processing for storing pitch data and the like in the register is performed (step C4), and priority calculation processing is further performed (step C5). ). Then, the process returns to the main flow.
[0016]
In step C2, if the MIDI event is not a sounding event but control data such as a control change, it is determined whether or not the channel of the MIDI event matches the part number (step C6). If they match, the matched part number of the MIDI data is set in the register p (step C7). Next, it is determined whether or not the received MIDI event includes control data that gives a timbre change. If included, the received control data is stored in the RAM area corresponding to the part number [p]. To store.
[0017]
That is, it is determined whether or not a pitch bend has been received (step C8), and when received, the P of the part number (p) in the RAM area shown in FIG. The received value is stored in PB [p] (step C9). Further, it is determined whether or not a vibrato has been received (step C10), and when received, the P of the part number (p) in the RAM area shown in FIG. The received value is stored in VB [p] (step C11).
[0018]
Next, it is determined whether or not the weight of the envelope step has been changed (step C12). If the weight has been changed, P of the part number (p) in the RAM area shown in FIG. The changed value is stored in ES [p] (step C13). Further, it is determined whether or not the part offset has been changed (step C14). When the part offset has been changed, P of the part number (p) in the RAM area shown in FIG. The changed value is stored in PO [p] (step C15).
[0019]
Even when MIDI data is not received in step C1 or when the MIDI channel does not match the part number in step C6, the envelope step weight and part offset values set in the part number (p) are the same. In Steps C12 and C14, it is determined whether or not the musical tone generator has been changed by a switch operation. If changed, the changed value is stored in Steps C13 and C15.
Next, priority calculation (recalculation) is executed based on the value of the stored control data (step C16). Then, the process returns to the main flow.
[0020]
FIG. 10 is a flow of priority calculation in step C5 and step C16, and FIG. 11 is a characteristic curve representing a weighting conversion table used for priority calculation. In the flow of FIG. 10, the priority calculation process in step C5 is a priority calculation for a new sounding event, that is, a note-on event, and the priority calculation process in step C16 is a priority calculation of a sounding event that is already sounding in the sounding channel. Although it is a calculation, since it is basically the same operation, it is represented by the same flow.
[0021]
First, P The PB [p] pitch bend MIDI value is converted by the conversion table of FIG. After storing in PB, the calculation is performed by the following arithmetic expression (1) and stored in the register PB (step D1).
PB = {(X PB) x (T PB [n])} / 10 (1)
Here, the denominator value 10 is for normalization, that is, bit adjustment (the same applies to other arithmetic expressions).
[0022]
Next, P The MIDI value of the pitch bend of VB [p] is converted by the conversion table of FIG. After storing in VB, the value of the vibrato priority is calculated by the following equation (2) and stored in the register VB (step D2).
VB = {(X VB) x (T VB [n])} / 10 (2)
[0023]
Next, if the MIDI event is a pronunciation event, P The value of the envelope step of ES [p] is converted by the attack weight in FIG. After storing in ES, the priority of the envelope step is calculated by the following arithmetic expression (3) and stored in the register ES (step D3).
ES = {(X ES) x (T ES [n])} / 10 (3)
If the MIDI data is not a sounding event, the priority is recalculated by the arithmetic expression (3) according to the transition of the envelope step, as will be described later.
[0024]
Next, P The part offset value of PO [p] is converted by the conversion table of FIG. 11 and stored in the register PO (step D4).
Based on the priority value of each register, the average value of the overall channel priority is calculated by the following arithmetic expression (4) and stored in the register SS (step D8).
SS = (PB + VB + PO + ES) / 4 (4)
[0025]
The priority value stored in SS for the sounding event that is already sounding in each sounding channel is the priority VT corresponding to each channel number, that is, the voice number (v) in the RAM area shown in FIG. It is transferred to PR [v] and stored. On the other hand, the priority value stored in the SS for a new pronunciation event is used in the assignment process described below.
[0026]
FIG. 12 is a flowchart of the assignment process at step A5 in the main flow. First, it is determined whether or not the assignment flag ASF is 1 (step E1). If the ASF is 0, that is, if a new sounding event has not been received, there is no need for assignment, so this flow ends.
When the ASF is 1 and a new sounding event is received, the assignment process variable is initialized. That is, 255 (maximum value) is set in the register PL that sets the lowest priority currently found, and 0 (channel number 0) is set in the register CC that sets the channel number currently being investigated. 0 is set in the register CL for setting the lowest priority channel number found (step E2).
[0027]
Next, the priority of the current sounding channel is set in the register P for setting the priority of the sounding channel under investigation (step E3). Initially, the value of the channel number CC currently being investigated is zero. Next, it is determined whether or not the value of P is 0 (step E4). That is, it is determined whether or not the priority of the sound channel currently under investigation is 0 and the sound channel is muted. In this case, the value of P, that is, 0 is set in PL, and the value of CC, that is, the channel number currently being investigated is set in CL (step E5).
[0028]
If the value of P is not 0 in step E4, it is determined whether or not the value of P is smaller than the value of PL (step E6). That is, it is determined whether the priority of the sound channel currently under investigation is lower than the lowest priority currently found. If the value of P is smaller than the value of PL, the value of P is set in PL, and the channel number of CC is set in CL (step E7). In other words, the sound channel currently under investigation is replaced with the channel number of the lowest priority currently found.
[0029]
After this replacement, or when the value of P is greater than or equal to the value of PL in step E6, the value of CC is incremented (step E8) and the next channel number is designated. Then, it is determined whether or not the incremented CC value is less than 8, that is, whether or not the maximum channel number is 7 or less (step E9). If the CC value is less than 8, the next channel number exists, so the process proceeds to step E3 and the above process is repeated.
[0030]
For example, in the example of FIG. 6, after setting 50, which is the priority of tone 0 of channel number 0, to P in step E3, since the value of P is not 0 in step E4, the process proceeds to step E6. In step E6, since the value 50 of P is smaller than the value 255 of PL, the process proceeds to step E7, where priority 50 is set in PL and channel number 0 is set in CL. Next, in step E8, the next channel number 1 is set, and the process proceeds to step E3.
[0031]
In step E3, the priority 42 of tone 1 of channel number 1 is set to P. Then, the process proceeds to Step E3 and Step E5. In step E5, since the value 42 of P is smaller than the value 50 of PL, the channel number of the lowest priority that has been found is switched, and the process proceeds to step E6 where priority 42 is set in PL and channel number 1 is set in CL. set.
[0032]
Thus, if the value of P is not 0 in step E4, the loop from step E3 to step E9 until the value of CC becomes 8 in step E9, that is, until the priorities of all sounding channels are searched. Are repeatedly executed to search for the sound channel (CL channel number) having the lowest priority (priority 8 in the example of FIG. 6) among all sound channels. Then, the value of CL is held as an assigned channel number (step E10). Therefore, the channel number 5 is held in the example of FIG. In step E4, if the value of P is 0 and the sound channel currently under investigation is muted, a sound event is unconditionally assigned to that sound channel, so after setting the channel number to CL in step E5. Advances to Step E10 and holds the value of CL as the assigned channel number.
[0033]
In step E10, after the channel number of the sound event with the lowest priority is held, the PL priority value is greater than the priority value of the new sound event stored in the register SS in step D8 in the flow of FIG. Is also smaller (step E11). If the PL priority is lower than the SS priority, a new sounding event can be assigned to the currently designated sounding channel. In this case, it is determined whether or not PL is 0, that is, whether or not the priority is 0 and the sound is muted (step E12).
[0034]
If PL is not 0, the sounding event level in the assigned channel number is not 0 (silenced state), so forced fast dump processing is performed to forcibly mute the sounding event (step E13). On the other hand, when PL is 0, the sound generation channel has already been muted, and there is no need to perform forced first processing. After the forced fast dump process in step E13, or when PL is 0 (silenced state) in step E12, that is, when assignment of a sound event that is a newly received MIDI event is completed, 0 is assigned to the assignment flag ASF. Set (step E14). Then, the process returns to the main flow.
[0035]
FIG. 13 is a timer interrupt flow for searching for the transition of the envelope step of the sounding event being sounded in each sounding channel. When a timer interrupt is generated at regular intervals, 0 is set to a pointer v designating a channel number (step F), and the following loop processing is executed while incrementing v. That is, it is determined whether or not the register EnvStep [v] for storing the envelope step of the tone generation channel [v] designated by v has changed (step F2). If there is a change, V in FIG. The value of ES [v] is updated (step F3). And updated V The priority of the sound generation channel [v] is recalculated according to the value of ES [v] (step F4).
[0036]
After the recalculation of priority, or when EnvStep [v] has not changed in step F2, the value of v is incremented (step F5). Then, it is determined whether or not the value of v is greater than 7 (step F6). If the value of v is 7 or less, the process proceeds to step F2 to repeat the loop process. If the value of v is greater than 7, the search for changes in all the sound channels has been completed, and the process returns to the main flow.
[0037]
As described above, according to the configuration of the musical tone generating device of the above embodiment, when a plurality of sound producing parts are shared by a predetermined number of sound producing channels, the control for giving a timbre change to the sound producing event assigned to each sound producing channel. Priority is calculated according to the type of data, the step of the envelope of the sound event, and each sound part, and when a new sound event occurs when all sound channels are sounded, the new sound event If the priority of is higher than the lowest priority among the sounding events being sounded, the sounding event of the sounding channel is forcibly muted and a new sounding event is assigned.
[0038]
Further, the program of the above embodiment is a program for generating a musical sound to be executed by a computer of the musical sound generating device,
Depending on the type of control data that gives the timbre change to the sound event assigned to each sound channel of the sound means that shares multiple sound parts by a predetermined number of sound channels, the step of the sound event envelope, and each sound part The step of setting the priority coefficient, and when a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, the sounding event being sounded in each sounding channel and the priority for the new sounding event are set. A step of calculating based on a priority coefficient, a step of determining whether or not the lowest priority among the priority of each sound channel calculated by the step of calculating is lower than the priority of a new sound event, This determination step determines the priority of the new pronunciation event with the lowest priority. Forcibly mute the lowest priority pronunciation event when it is determined to be lower than the degrees and the operating portions and assigning a new sound event to its sound channel.
In other words, this program causes the CPU 1, which is a computer of the musical sound generating device, to function as a plurality of means for executing each process in the musical sound generating process.
[0039]
Therefore, according to such a musical sound generator or musical sound generation processing program, when a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, the sounding event being sounded is forcibly Even if the assignment process for securing the sound channel by muting the sound is performed, there is no musically unnatural influence.
[0040]
In the above embodiment, the priority coefficient is set according to each sound part. In this case, a high priority is set for the main melody sound part such as a melody part. Therefore, it is possible to avoid forcibly muting the main melody pronunciation part, which is an important pronunciation part.
In the above embodiment, a higher priority is set as the timbre change amount given by control data such as program change is larger. Therefore, it is possible to avoid forcibly muting the pronunciation event that the user consciously emphasized.
[0041]
Further, in the above embodiment, the envelope step of the sounding event being sounded is searched at regular intervals, and the priority of each sounding channel is recalculated. Therefore, it is possible to perform a quick assignment process with respect to the occurrence of a new sounding event. For example, it is possible to avoid the occurrence of sound interruption due to the delay of the sounding event assignment.
[0042]
In the above embodiment, the case where assignment processing based on priority is performed on the input of MIDI data has been described. However, even when keyboard input is set in the flow of FIG. 8, performance input from the keyboard is performed. Depending on the control data included in the data and the sounding part designated for each sounding channel, assignment processing based on priority may be performed for keyboard input. In this case, naturally, the same effect as the above embodiment can be obtained.
[0043]
【The invention's effect】
According to the present invention, when a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, the assigning process for forcibly muting the sounding event being sounded and securing the sounding channel is performed. There is no musically unnatural influence even if it goes.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a musical sound generator according to the present invention.
2 is a diagram showing a data configuration of an area of a RAM in FIG.
FIG. 3 is a diagram showing a data configuration example of priority weights of envelope steps in FIG. 2;
4 is a diagram showing a data configuration example of priority weights of timbre parameters in FIG. 2; FIG.
5 is a diagram showing a data configuration example of a sound part parameter in FIG. 2. FIG.
6 is a diagram showing a data configuration example of channel priority in FIG. 2. FIG.
FIG. 7 is a main flowchart showing the operation of the CPU in FIG. 1;
FIG. 8 is a flowchart of switch processing in FIG. 4;
FIG. 9 is a flowchart of the MIDI process in FIG. 4;
10 is a flowchart of priority calculation processing in FIG. 9;
FIG. 11 is a characteristic curve representing a weight conversion table used for priority calculation.
12 is a flowchart of assignment processing in FIG. 4;
FIG. 13 is a flowchart of a timer interrupt.
[Explanation of symbols]
1 CPU
3 ROM
4 RAM
5 Keyboard 6 Switch part 7 MIDI interface 8 Sound generator LSI

Claims (2)

Each step of a first priority coefficient corresponding to each type of control event that gives a pitch change to the sounding event assigned to each sounding channel of the sounding means having a predetermined number of sounding channels, and the envelope of the sounding event Storage means for storing a second priority coefficient corresponding to
A first storage means for storing a received value of the received control event when the control event is received;
If a change in the envelope step is detected, second storage means for storing the changed step ;
When a new sounding event occurs, the first priority coefficient stored in the storage means, the received value stored in the first storage means, and the second priority coefficient corresponding to the attack step of the envelope Based on a first calculating means for calculating a priority for the new pronunciation event;
When the received value is stored in the first storage means, or when the changed step is stored in the second storage means , the first priority coefficient stored in the storage means, A priority for calculating a sounding event during sound generation is calculated based on the received value stored in the first storage means and the second priority coefficient corresponding to the envelope step stored in the second storage means. Two calculating means;
When a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, the lowest priority among the sounding channel priorities calculated by the second calculating means is the first priority. Determining means for determining whether or not the priority of the new pronunciation event calculated by the one calculating means is lower;
When the determination means determines that the lowest priority is lower than the priority of the new sounding event, the sounding event having the lowest priority is forcibly silenced and the new sounding event is assigned to the sounding channel. Assigning means for assigning
Musical sound generator with A first priority coefficient corresponding to each type of control event that gives a pitch change to a sounding event assigned to each sounding channel of sounding means that shares a plurality of sounding parts by a predetermined number of sounding channels, and the sounding In the computer of the musical tone generator having storage means for storing the second priority coefficient corresponding to each step of the envelope of the event,
A first storing step of storing a received value of the received control event when the control event is received;
If a change in the envelope step is detected, a second storage step for storing the changed step;
When a new sounding event occurs, the first priority coefficient stored in the storage means, the received value stored in the first storage step, and the second priority coefficient corresponding to the attack step of the envelope A first calculation step for calculating a priority for the new pronunciation event based on:
When the received value is stored in the first storage step, or when the changed step is stored in the second storage step, the first priority coefficient stored in the storage means A second calculating step of calculating a priority for a sounding event during sound generation based on the stored received value and a second priority coefficient corresponding to the step of the envelope stored by the second storing step When,
When a new sounding event occurs when all of the predetermined number of sounding channels are in a sounding state, the lowest priority among the sounding channel priorities calculated by the second calculating step is the first priority. A determination step of determining whether or not the priority of the new pronunciation event calculated by the calculation step of 1 is lower;
If it is determined in this determination step that the lowest priority is lower than the priority of the new sounding event, the sounding event having the lowest priority is forcibly silenced and the new sounding event is assigned to the sounding channel. An assignment step to assign
A program for musical tone generation processing, characterized in that is executed.

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