So I got it to work from a library. So that's good, thanks for your help.

So the library was added at the system properties activity level, so I did have to add script to all activities Volume buttons.

Here is the sample of the code I used for the volume.

var onHoldInterval = 50;
onHold = function()
{
sendCommand("!1MVLUP").executeActions();
onHoldInterval=1;
};