Just run into the same issue, used ls-monitor to debug which luna call happen when I increase/decrease the volume via MR:

17454.780 TX call 97 com.webos.platformstarfish (l2iPJwg6) com.webos.service.audio (JGZ7eyNQ) (null) /master/volumeUp «{}»

so we can use
ssap://audio/volumeUp
ssap://audio/volumeDown
ssap://audio/getVolume also get called when volume adjusted.

{
        "virtualService": "audio",
        "version": 1,
        "methods": [
                {
                        "path": "/getVolume",
                        "provider": "com.webos.service.audio/master/getVolume"
                },
                {
                        "path": "/setVolume",
                        "provider": "com.webos.service.audio/master/setVolume"
                },
                {
                        "path": "/volumeUp",
                        "provider": "com.webos.service.audio/master/volumeUp"
                },
                {
                        "path": "/volumeDown",
                        "provider": "com.webos.service.audio/master/volumeDown"
                },
                {
                        "path": "/getMute",
                        "provider": "com.webos.service.apiadapter/audio/getMute"
                },
                {
                        "path": "/setMute",
                        "provider": "com.webos.service.apiadapter/audio/setMute"
                },
                {
                        "path": "/getStatus",
                        "provider": "com.webos.service.apiadapter/audio/getStatus"
                },
                {
                        "path": "/changeSoundOutput",
                        "provider": "com.webos.service.apiadapter/audio/changeSoundOutput"
                },
                {
                        "path": "/getSoundOutput",
                        "provider": "com.webos.service.apiadapter/audio/getSoundOutput"
                }
        ]
}
{
        "service": "com.webos.service.audio",
        "methods": [
                {
                        "path": "/tv/setOffsetDelay",
                        "description": "Set av sync delay",
                        "requiredPermissions": [
                                "CONTROL_AUDIO"
                        ]
                },
                {
                        "path": "/master/getVolume",
                        "description": "Get the volume.",
                        "requiredPermissions": [
                                "CONTROL_AUDIO"
                        ]
                },
                {
                        "path": "/master/setVolume",
                        "description": "Set the volume.",
                        "requiredPermissions": [
                                "CONTROL_AUDIO"
                        ]
                },
                {
                        "path": "/master/volumeUp",
                        "description": "Increase the volume.",
                        "requiredPermissions": [
                                "CONTROL_AUDIO"
                        ]
                },
                {
                        "path": "/master/volumeDown",
                        "description": "Decrease the volume.",
                        "requiredPermissions": [
                                "CONTROL_AUDIO"
                        ]
                }
        ]
}
{
        "service": "com.webos.service.btaudiosnk",
        "methods": [
                {
                        "path": "/open",
                        "description": "Enable BT Sound Share feature",
                        "requiredPermissions": [
                                "CONTROL_BLUETOOTH"
                        ]
                },
                {
                        "path": "/close",
                        "description": "Disable BT Sound Share feature",
                        "requiredPermissions": [
                                "CONTROL_BLUETOOTH"
                        ]
                },
                {
                        "path": "/getState",
                        "description": "Get status of BT devices",
                        "requiredPermissions": [
                                "CONTROL_BLUETOOTH"
                        ]
                },
                {
                        "path": "/disconnect",
                        "description": "To disconnect the bluetooth device connected to TV",
                        "requiredPermissions": [
                                "CONTROL_BLUETOOTH"
                        ]
                }
        ]
}

eArc Connected Sound Bar Volume #46

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