P1

Pronunciation control number (0-7)

●03H PAUSE Pause of songs and sound effects

P1

Pronunciation control number (0-7)

●04H PAUSE OFF Cancels the pause of songs and sound effects.

P1

Pronunciation control number (0-7)

●05H SEQUENCE VOLUME Volume adjustment or fade in/out

P1

Pronunciation control number (0-7)

P2

Volume (0-255) Around 128, the higher the value, the louder the volume. Previously, the default was 127, and the volume could only be lowered, but from Ver-2.00 onwards, it is possible to increase the volume higher than the sampled volume. However, be careful as setting an extremely large value may cause distortion.

P3

Fade Rate (0-255) Specify the time it takes for the current sequence volume to reach the specified sequence volume as a rate (0-255). The larger the value, the slower the change, with 255 being the longest and 1 being the shortest. (If it is 0, there will be no fade and only the sequence volume will be set.) The fade will be performed from the current sequence volume to the specified sequence volume. Fade-in or fade-out is determined by whether the specified sequence volume is larger or smaller than the current sequence volume.

●06H STOP ALLStop all performances

No parameters

●07H TEMPO CHANGE Change the tempo of songs and sound effects

P1

Pronunciation control number (0-7)

P2

dummy (exists to place P3 and P4 at even addresses)

P3-P4

Tempo value (+32767 --> -32768) Relative tempo value to the standard tempo value (0000h). The tempo will double every 1000h (4096), and if it is negative, the tempo will be halved. In other words, you can control the time until the tempo doubles (or halves) with 4096 steps of precision. Since 0 is the standard tempo, you can return to the original tempo at any time by specifying 0000h.

●08H MAP CHANGE Perform a map change

P1

Area map number (0-255) This is a sequential area map number that specifies the number of area maps from the beginning within the sound area map.

Be sure to change the map at least once after starting the sound driver. From now on, you will have to do this every time the area map changes. Please follow steps 1 to 6 below to change the map.

How to change map

order	Processing content	explanation
1	stop all pronunciations	Issue the “Sound Initial (10h)” command. Specify all sound stops and all initializations with parameters.
2	Switch area map	Issue the "Map Change (08h)" command. In the parameter, specify the number of the area map you want to switch to.
3	Transfer sound data	Transfer sound data from SH address 25A0B000. If you have sound data divided into multiple files, transfer each data according to the area map.
4	Notify transfer completion	Set all the transferred bits of the sound area map CRNT work (from SH address 25A00500h) to "1" for the amount of data that has been transferred.
5	Set DSP	Issue the "Effect Change (83h)" command if necessary.
6	Set up the mixer	Issue the "Mixer Change (87h)" command. Be sure to set the mixer even if you are not using DSP.

As long as the map change is complete, you can play the sequence at any time. To play a sequence, issue a sound control command (sequence start, sequence stop, etc.) to control sequence playback.

Note 1: If you switch the area map or replace the sound data in use while the sound is still playing, the system may go out of control.

Note 2: The DSP work RAM is used for internal processing of the DSP, so the contents of this area are constantly being rewritten by the DSP while the DSP is operating. Care must be taken when changing the area map, such as changing the size or address of the DSP work RAM. If the DSP is running, the sound data transferred to the location previously used as DSP work RAM will be destroyed.

●09H DIRECT MIDI CONTROL Send MIDI events as commands

P1

MIDI command word (00h-FFh)

P2

MIDI channel word (00h-FFh)

P3

MIDI data 1 (00h-7Fh)

P4

MIDI data 2 (00h-7Fh)

	7	6	5	4	3	2	1	0
0	Priority level					CMD
1	KNo			MIDI Ch
2	MIDI Data #1
3	MIDI Data #2

Priority level	0-31	Pronunciation priority at Sequence Start
CMD	0-7	MIDI command
KNo	0-7	Pronunciation control number
MIDII Ch	0-31	MIDI channel
MIDI data #1	0-127	MIDI data byte #1
MIDI data #2	0-127	MIDI data byte #2

Correspondence with actual MIDI Event

CMD value	Corresponding MIDI Event
0	(80h-8Fh) Note Off Event
1	(90h-9Fh) Note On Event
2	(A0h-AFh) After Touch
3	(B0h-BFh) Control Change
4	(C0h-CFh) Program Change
5	(D0h-DFh) Channel Pressure
6	(E0h-EFh) Pitch Wheel
7	(F0h-FFh) System Massage

Issue the "MIDI Direct Control (09h)" command using the 4 bytes of the message block as parameters P1, P2, P3, P4. However, there are advantages and disadvantages as listed below, so please consult with your sound creator before choosing the best method.

Strong Points

• Real-time control that is not possible with sequence data in advance is possible.
• There is no need to create data, such as creating a sequence or compressing it.
• Since compression and decompression processing can be omitted, no additional processing is required.

• Although you can do everything, in some cases you may have to understand a lot of the content and create advanced programs. (It cannot be used correctly unless you know the relationship between MIDI channels and corresponding tones, DSP programs and mixer specifications, etc., so coordination with the sound creator is necessary.)

●0AH START VOLUME ANALYZER Start input level analysis of Digital Audio In

no parameters

●0BH STOP VOLUME ANALYZER Digital Audio In input level analysis completed

no parameters

●0CH DSP STOP Stopping and initializing DSP

no parameters

●0DH ALL NOTE OFF All sound stops

no parameters

●0EH SEQUENCE PAN Control PANPOT from the game

P1

Pronunciation control number (0-7)

P2

The 7th bit is a switch. This bit instructs whether to control the sequence PAN. 0 controls the sequence PAN. If it is 1, no control will be performed. Bits 6 to 0 are the PAN data values that MIDI can take (0 to 7FH).

○ The values in the table are SCSP PAN data (00h-1Fh: 32 steps).
○ Since MIDI PAN data has 128 levels, the lower 2 bits are ignored when converting to SCSP PAN data.

Left Center Right 00h ←−−−−−−−→ 40h ←−−−−−−−→ 7Fh

Correspondence table between SCSP PAN and MIDI PAN

PAN	L (db)	R (db)	Localization		PAN	L (db)	R (db)	Localization
00h	-00.0	-00.0	C		10h	-00.0	-00.0	C
01h	-03.0	-00.0	R1		11h	-00.0	-03.0	L1
02h	-06.0	-00.0	R2		12h	-00.0	-06.0	L2
03h	-09.0	-00.0	R3		13h	-00.0	-09.0	L3
04h	-12.0	-00.0	R4		14h	-00.0	-12.0	L4
05h	-15.0	-00.0	R5		15h	-00.0	-15.0	L5
06h	-18.0	-00.0	R6		16h	-00.0	-18.0	L6
07h	-21.0	-00.0	R7		17h	-00.0	-21.0	L7
08h	-24.0	-00.0	R8		18h	-00.0	-24.0	L8
09h	-27.0	-00.0	R9		19h	-00.0	-27.0	L9
0Ah	-30.0	-00.0	R10		1Ah	-00.0	-30.0	L10
0Bh	-33.0	-00.0	R11		1Bh	-00.0	-33.0	L11
0Ch	-36.0	-00.0	R12		1Ch	-00.0	-36.0	L12
0Dh	-39.0	-00.0	R13		1Dh	-00.0	-39.0	L13
0Eh	-42.0	-00.0	R14		1Eh	-00.0	-42.0	L14
0Fh	- ∞	-00.0	R15		1Fh	-00.0	- ∞	L15

●10H SOUND INITIALIZE Initialize the sound driver

P1

Stop all sequence playback (0-1)

P2

Stop all PCM stream playback (0-1)

P3

Stopping CD-DA playback (0-1)

P4

DSP initialization (0-1)

P5

Mixer initialization (0-1)

The values of P1 to P5 of the Sound Initial (10h) command execute the corresponding process when it is 01H, and are ignored when it is any other value. This command is mainly intended to be set just before issuing a MAP change.

Details of P1 to P5

• The P1 execution instruction (01h) will stop all currently sounding sequences. This does not affect other sounds (PCM stream playback, CD-DA playback).
• The P2 execution instruction (01h) will stop all PCM stream playback currently in progress. This does not affect other sounds (sequence playback, CD-DA playback).
• According to the P3 execution instruction (01h), the direct components [EFSDL] and [EFPAN] of the CD-DA input components [EXTS0] and [EXTS1] are set to "00H" to turn off their output. Masu. Therefore, if the CD-DA input is processed and output using an effect, the volume will not be turned off. This does not affect other sounds (sequence playback, PCM stream playback).

  Sound address	100217H.b ← 00H
  	100237H.b ← 00H

• The P4 execution instruction (01h) initializes the DSP section built in the sound source. Actually, set the following data in the DSP register to turn off the output of the effect component and prohibit the DSP from accessing (R/W) the D-RAM. The mixer will also be initialized at this time, but it will be restored. This does not affect other sounds (sequence playback, CD-DA playback, direct components of PCM stream).

  [IMXL]	← 00H
  [EFSDL],[EFPAN]	← 00H
  [MPRO]	← 00000000H
  [COEF]	← 000H
  [TEMP]	← 000000H

• According to the execution instruction (01h) of P5, write [EFSDL]=[EFPAN]=0 to all [EFREG] in the mixer section so that the effect components will not be output. This does not affect other sounds (sequence playback, CD-DA playback, direct components of PCM stream).

●11H YAMAHA 3D CONTROL YAMAHA 3D sound control

P1

Distance (0-127) The distance from the listening point to the virtual sound source for YAMAHA3D sound.
If the value is 0, the distance is 0, and the larger the value, the farther away it is.

P2

Direction (0-127) This is the direction of the virtual sound source of YAMAHA3D Sound as seen from the listening point.
A value of 0 means 0 degrees to the right, 32 means 90 degrees to the right, 64 means 180 degrees to the right, and 96 means 270 degrees to the right.

P3

Height (0-127) The height of the virtual sound source of YAMAHA3D Sound as seen from the listening point.
A value of 0 is directly below, 32 is at eye level, 64 is directly above, and 96 is at eye level behind.

●12H QSOUND CONTROL Qsound control

P1

Channel number (0-7) This is the number of the channel that controls the Q sound.
The maximum number of channels is 8, so specify 0 to 7.

P2

PAN Position (0-30) Specifies the PAN position of the Q sound. There are 15 steps to the left and right: 0 is 90 degrees to the left, 15 is to the center, and 30 is 90 degrees to the right.

●13H YAMAHA 3D INITIALIZE YAMAHA 3D, Qsound localization initialization

no parameters

●14H TEMPO MODE

P1

Tempo mode (0/plus/minus) If you change the tempo during sequence playback, conventionally the original tempo will be returned to when the sequence loops. In this version, we have prepared several tempo modes to avoid this.

0: Normal mode

Performs tempo processing as before.

1 - 127: ignore mode

Ignores tempo changes during the sequence. Tempo control is possible using only host commands.

128 - 255: Relative tempo mode

All tempo changes during the sequence will take effect. On the host side, set the relative value for it using the TEMPO RATIO command. The result is just like shifting the tempo changes caused by the sequence using the TEMPO RATIO command.

●15H TEMPO RATIO Relative tempo value setting

P1-P2

Relative tempo value (+32767 --> -32768) Relative tempo value to the standard tempo value (0000h). The tempo will double every 1000h (4096), and if it is negative, the tempo will be halved. In other words, you can control the time until the tempo doubles (or halves) with 4096 steps of precision. Since 0 is the standard tempo, you can return to the original tempo at any time by specifying 0000h.

●80H CD-DA LEVEL Adjust the CD-DA level.

P1

CD-DA Level Left 8 levels (00h-E0h) CD-DA output level setting. There are 8 levels, with 00h being the lowest volume (=Off) and E0h being the highest volume.

Off ←−−−−−−−−→ Max 00h,20h,40h,60h,80h,A0h,C0h,E0h

P2

CD-DA Level Right 8 levels (00h-E0h) CD-DA output PAN setting.

Details of 8 stages: (off) 00h,20h,40h,60h,80h,A0h,C0h,E0h (MAX)

CD-DA playback is a method of directly outputting audio data from CD audio tracks using hardware. This is the same principle as a tape recorder, which plays back the recorded audio as it is. The audio data read from the CD is automatically transferred to the SCSP, so all you have to do is set the CD-DA level of the SCSP to start outputting audio.

CD-DA flow

To set the audio output from SCSP, use the "CD-DA Level (80h)" and "CD-DA Pan (81h)" commands of the sound control commands. Audio data is transferred directly from the CD interface to SCSP and output as audio. Therefore, the main system only issues a playback request to the CD interface, and there is no need to read data or transfer it to sound memory. This is the least demanding playback method for the main system and sound system, but it will occupy the CD continuously during playback. In other words, you will not be able to access the CD for anything other than producing sound. However, if this is allowed, it will be possible to achieve the maximum quality with this sound system.
The frequency and data width are fixed at 44.1KHz, 16 bits, which is equivalent to the CD standard, and pitch and tempo cannot be changed during playback. At the same time, achieving this quality requires an extremely large amount of audio data, so one CD can only hold about 10 to 20 songs, just like a regular music CD. In reality, it contains game programs, image data, etc., so it can only contain about 5-6 songs.

CD-DA data is PCM audio waveform data itself. Therefore, CD-DA data has the recorded PCM waveform data as it is as a data file. Although it is very large data, it is the simplest audio data that does not require any processing or modification.
CD-DA data can be created using the sound tool waveform editor provided by SEGA or commercially available waveform editing tools. Any tool will do as long as it can output 16-bit stereo PCM data at 44.1KHz. There are two methods: directly digitally recording songs and sound effects, and converting analog audio to digital. In the case of monaural, the same data is entered in Lch and Rch.

 Lch low(8bit)

 Lch high(8bit)

 Rch low(8bit)

 Rch high(8bit)

 Lch low(8bit)

 Lch high(8bit)

 Rch low(8bit)

 Rch high(8bit)

 :
 :
 :
 :
 :

 :
 :
 :
 :
 :

 Lch low(8bit)

 Lch high(8bit)

 Rch low(8bit)

 Rch high(8bit)

Note 2: When using DSP (effects) for CD-DA, mixer settings are required. When using DSP, prepare the necessary mixer data and issue the "Mixer Change (87h)" command. Even if there is no sequence playback, tone data is required for mixer settings.

●81H CD-DA PAN CD-DA output Panpot settings

P1

CD-DA PAN Left 32 levels (0-31)

P2

CD-DA PAN Right 32 steps (0-31)

●82H TOTAL VOLUME Total volume setting

P1

Total Volume 16 levels (0-15) This is the setting for the SCSP's total volume (overall volume for all playbacks). There are 16 levels, with 0 being the lowest volume (=Off) and 15 being the highest volume.

●83H EFFECT CHANGE Effect switching

P1

Effect bank number (0-15) If there are multiple DSP banks (DSP microprogram storage areas) in the current area map, specify the number of DSP banks from the beginning. One area map can have up to 16 DSP banks, so the value will be between 0 and 15. Always 0 if there is only one DSP bank.

●85H START PCM STREAM PCM stream playback starts

P1

bit7
0:mono 1:stereo

bit6-5
unused

bit4
0: 16bitPCM 1: 8bitPCM

bit3-0
Start playback PCM stream playback number (0-7) Up to 8 streams can be played at the same time, so specify the PCM stream playback number from 0 to 7. Please note that when playing in stereo, one playback number plays two streams, Lch/Rch. There is a maximum of 8 streams in total for monaural and stereo, so commands will be ignored if there are more than 8 streams.

P2

bit7-5
Direct sound output level 8 levels (0-7) Direct sound output level setting. There are 8 levels, with 0 being the lowest volume (=Off) and 7 being the highest volume.

bit4-0
Direct sound output PAN 32 levels (0-31) Direct sound output PAN setting. See SEQUENC PAN section on page 13 for details.

P3-P4

PCM stream buffer start address (0000h-FFFFh) This is the start address of the PCM stream buffer. Specify the upper 16 bits of the 20-bit address.

P5-P6

PCM stream buffer size (0000h-FFFFh) Size of PCM stream buffer. Since it is the number of samples for 1 channel, the same value will be entered whether it is MONO, STEREO, 16bit or 8bit.

P7-P8

pitch word (0000h-7FFFh) Specify the SCSP pitch register value (16 bits) as is.

Pitch word (16bit) configuration

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	OCT				0	FNS

OCT: Specify the octave as a two's complement number. You can specify from -8 octave to +7 octave.
FNS: Specify in 1024 steps from the standard pitch (0) to one octave above (1023).
Bit 15 and bit 10 are always 0.

P9

bit7-3
Effect Input Channel (0-15) [P9=Rch] DSP 16ch Effect In selection. There are 16 channels of DSP effect input, so specify 0 to 15. Please refer to "Chapter 6 Supplementary Information 6-7 DSP and Mixer" for a detailed explanation.

bit2-0
Effect Input Level 8 levels (0-7) Specify the level of the direct sound sent to the effect input channel from 0 to 7. There are 8 levels, with 0 being the lowest level (=Off) and 7 being the highest level.

P10

bit7-3
Effect input channel (0-15) [P10=Lch]

bit2-0
Effect input level 8 levels (0-7)

P11

Total level 256 levels (max:00h-FFh:min) This is the total level of the slot used for stream playback. Direct sound You can adjust the volume more finely than the output level.

A, B, A, B, A, B.... will be played in a continuous loop.

order	process
1	Transfer the first waveform data to the waveform data A and waveform data B areas.
2	Issue the sound control command "PCM start (85h)".
3	After playing waveform data A, transfer the next waveform data to the waveform data A area.
4	After playing waveform data B, transfer the next waveform data to the waveform data B area.
5	Repeat steps 3 and 4 above
6	To terminate, issue the "PCM stop (86h)" sound control command.

Note: The buffer size, transfer method, transfer timing, etc. are at the discretion of the main system, so please choose the most suitable method according to the situation without being bound by the above steps.

How to hold the data area

Buffer rewriting timing

Example of how to hold a buffer	Play position value
If you have two 4K sample buffers	0, 1, 0, 1, 0, 1 ...
If you have three 4K sample buffers	0, 1, 2, 0, 1, 2, 0, 1, 2 ...
If you have 16 4K sample buffers	0, 1, 2, 3 - - - - 12, 13, 14, 15, 0, 1, 2, 3 ...

The main system should monitor this playback position and transfer the next waveform data. The PCM stream buffer can take up to 64K samples, so you can select from a minimum of 2 sides to a maximum of 16 sides.
It is also possible to generate an interrupt to the main system when the playback position is updated, so please use this if necessary. The control information for this interrupt is included in the system interface work, so please refer to section ``7 System Interface Work'' for the setting details.

Transfer load

stereo playback

Supports playback frequencies other than 44.1KHz

The pitch range is up to ±8 octaves (OCT), and one octave can be further divided into 1024 steps (FNS), so it is possible to correspond to any frequency within this precision range, but in reality, Since no irregular settings are made, they are listed in the correspondence table.

sampling rate	OCT	FNS	Setting value
44.1kHz	00	0000	0000
32kHz	0F	01CE	79CE
22kHz	0F	0000	7800
16kHz	0E	01CE	71CE
11kHz	0E	0000	7000
8kHz	0D	01CE	69CE
5.5kHz	0D	0000	6800
4kHz	0C	01CE	61CE

• Notes on continuous transfer

  When transferring waveform data, avoid continuous transfer for a long time to allow the sound CPU to operate. Please note that while the main system is accessing the sound memory, this will take priority and the sound CPU will not be able to operate. If continuous transfer is required, divide it into transfers of about 1 msec at most. By leaving a gap, the sound CPU will be able to operate.

• Precautions when using DSP

  Mixer settings are required when using DSP (effects) for PCM stream playback. When using DSP, prepare the necessary mixer data and issue the mixer setting command. Even if there is no sequence playback, tone data is required for mixer settings.

Although it is functionally possible to play up to 8 PCM streams, it is practically impossible due to processing power. Stream playback does not run on the sound CPU alone, so we recommend taking the game's processing speed into consideration and experimenting from the early stages of development. Please be especially careful in games that heavily use SH2 for calculations using polygons, as this may cause a frame over.

●86H STOP PCM STREAM PCM stream playback stop

P1

Stop playback PCM stream playback number (0-7)

●87H MIXER CHANGE Switching the mixer

P1

Tone data bank number (0-15) If there are multiple tone banks (tone data storage areas) in the current area map, this is a number to distinguish between them. One area map can have up to 16 tone banks, so the value will be anywhere from 0 to 15. (Refer to 5-1-4 Sound Area Map CRNT Work Map Information).

P2

Mixer number in tone data (0-127) Multiple mixer data can be stored in one tone data, so specify the number of mixer data from the beginning of the tone data. One tone data can store up to 128 mixers, so the value will be any value from 0 to 127. Always 0 if there is only one mixer data.

What is a mixer?

Mixer configuration

Slot Direct mixer

: Direct (does not pass through DSP) output level and PAN from sound slot

CD-DA Direct mixer

: Direct (does not pass through DSP) output level and PAN from CD-DA

Effect In mixer

: Input level to DSP

Effect Out mixer

: Effects from DSP (through DSP) output level and PAN

Of these, the "Slot Direct mixer" and "Effect In mixer" are already set in the tone data, so there is no need to control them specially. Also, for the "CD-DA Direct mixer", dedicated "CD-DA Level (80h)" and "CD-DA Pan (81h)" commands are available, so you can control them using them.

Therefore, when we say "mixer" in this manual, we specifically mean the "Effect Out mixer" mentioned above. In this manual, the mixer refers to the 16ch effect level and PAN settings output from the DSP.

DSP and mixer

In addition, since all sounds from sequence playback, PCM stream playback, and CD-DA playback are input to the DSP, it is important to correctly understand which sound is going into which channel and which channel is going out in which situation. must be controlled above. When switching effects, check in advance which mixer is compatible and what the mixer specifications are.

Note that bank selection is not possible when using MIDI control changes to make mixer settings. This is because, due to the MIDI format, two arguments, the bank and mixer number, cannot be sent at the same time. Therefore, only the mixer number will be sent, but the bank at that time will be the bank selected by bank change.

●88H MIXER PARAMETER CHANGE Switching mixer parameters

P1

Effect Output Channel (0-17) DSP 16ch Effect Out selection. There are 16 channels of DSP effect output, so specify 0 to 15. Also, when selecting CD-DA, specify 16 (Lch) or 17 (Rch).

P2

bit7-5
Effect Output Level 8 levels (0-7) Specify the level of the effect sound output from the effect output channel from 0 to 7. There are 8 levels, with 0 being the lowest level (=Off) and 7 being the highest level.

bit4-0
Effect Output PAN 32 levels (0-31) Specify the PAN of the effect sound output from the effect output channel from 0 to 31. For details, refer to "Chapter 7 Appendix 7-2 Details of SCSP PAN (32 levels)".

●89H HARDWARE CHECKHardware check

P1

Check item

00h: DRAM 4Mbit read/write

01h: DRAM 8Mbit read/write

02h: SCSP MIDI

03h: Sound source output (L/R)

04h: Sound source output (L)

05h: Sound source output (R)

The details of the check performed by the hard check (89h) command are as follows. When checking, specify a value from 0 to 5 in command parameter P1, and the following checks will be performed depending on that value. The following values for all check results are stored in the system interface table (address 418h: word).

7FFFH:Memory check Error
8000H: Memory check OK

00h	Executes read/write check of sound D-RAM (4M bits). Please note that at this time, the DSP will be initialized to prohibit internal memory access. The check will write & read & compare all bits low/high, and the result will be stored in the system interface table.
01h	Executes read/write check of sound D-RAM (8M bits). Others are as above.
02h	Executes an operation check of the SCSP built-in MIDI. At this time, short-circuit the external MIDI input/output terminals. The check results are as above.
03h	A square wave is output from LR. Please note that SCSP slot 025B00000H will be forcibly used at this time. This sound will also turn off automatically in a few seconds. Also, no map data, song data, or tone data is required when issuing this command.
04h	A square wave is output only from the L side. Others are as above.
05h	Value of P1

●8AH PCM PARAMETER CHANGE Parameter switching for PCM stream during playback

P1

PCM stream playback number (0-7)

P2

bit7-5
Direct sound output level 8 levels (0-7)

bit4-0
Direct sound output PAN 32 levels (0-31)

P3-P4

pitch word(0000h-FFFFh)

P5

bit7-3
Effect input channel (0-15) [P5=Rch]

bit2-0
Effect input level 8 levels (0-7)

P6

bit7-3
Effect input channel (0-15) [P6=Lch]

bit2-0
Effect input level 8 levels (0-7)

P7

Total level 256 levels (max:00h-FFh:min)

●8BH PCM SLOT ALLOCATION Secure slot for PCM stream

P1

PCM stream playback number (0-7)

PCM streams use fixed slots, but those slots may be in use during sequence playback, and if you start a PCM stream, part of the sequence will be forcibly turned off. If you reserve a PCM slot in advance using this command, the above problem will be resolved.

●8CH PCM SLOT RELEASE Release slot for PCM stream

P1

PCM stream playback number (0-7)