This device is in the stock driver and mine has a generic profile, which is used by various devices.
As in Z-wave, each manufacturer uses different parameters to adjust its options, so to add sound and volume adjustments, it would be necessary to create a specific profile for this device and the necessary code to manage the parameter configuration.
For these create the Z-Wave Device Config Mc driver.
By making a change to this driver and the device manual you can configure the sound and volume parameters and then return to the original driver and the settings made will be maintained.