Feature request: stop_sounds for digilines noteblock

[digitalajb64]

I think that the ability to send the message "stop_sounds" to a Digilines Noteblock and to have it stop all current sounds would be useful for various reasons,
including if one wanted to make a power-based sound system where turning on power would play a startup and turning off power would kill the running sound and play a shutoff.

As an optional afterthought, these formats would also be useful:

{
    action = "stop_sounds",
    sound = "[whatever sound you want to stop]",
}
{
    action = "stop_sounds",
    sound = { "[sound1]", "[sound2]", ... },
}

-- And for consistency,
{
    action = "get_sounds"
}

— digitalajb64

[SwissalpS]

First off we need to find out if the engine even supports stopping sounds.

The second syntax is enough, first is not needed.