How to add customized sound system for DoubleE Volvo upgrade 3 arms excavator, st8 radio settings

here is the link from my shop website,
oliverhobby.com/products/cut-...
If you have any questions or are not sure whether it is the correct item you want, pls feel free to contact me before purchasing. please add my Facebook: Oliver Lan , profile.php?... ,or WhatsApp [phone]
Specification:
Manufacturer: CUT
Item Condition: New, Painted and Assembled
Material: Metal, Plastic
Scale: 1/14
The Package PRO Version Includes:
1/14 RC Hydraulic Excavator Model
ESC
Motor
Servo
Light System
Hydraulic System
Manual Quick Release Coupler
Flat Bucket
CNC 3-arms
FlySky ST8 Remote Controller and Receiver
Battery
USB Charging Cable
The Package Standard Version Includes:
1/14 RC Hydraulic Excavator Model
ESC
Motor
Servo
Light System
Hydraulic System
Manual Quick Release Coupler
Flat Bucket
CNC Big Arm, CNC Middle Arm, Die Casting Small Arm
FlySky ST8 Remote Controller and Receiver
Battery
USB Charging Cable
The Package Does Not Include:
Sound System
Hydraulic Oil

[@toucanhobby2400]

here is the link from my shop website,
oliverhobby.com/products/cut-sy010-ec160-excavator-up-rtr-ygy-spf7?_pos=1&_sid=6f6f21fbc&_ss=r&variant=43781173936317
If you have any questions or are not sure whether it is the correct item you want, pls feel free to contact me before purchasing. please add my Facebook: Oliver Lan , facebook.com/profile.php?id=100083176249155&mibextid=YMEMSu ,or WhatsApp [phone] ， [e-mail]

[@toucanhobby2400]

Thank you for your follow, for future detailed video will post to My new UA-cam channel name: Oliverhobby , link youtube.com/@oliverlan001?si=KzR4sg8D22bM3AN7 , please add my Facebook: Oliver Lan , facebook.com/profile.php?id=100083176249155&mibextid=YMEMSu ,or WhatsApp [phone] ， [e-mail]