@petersoncga
Hello, you almost did it right, you just cant pass that args with a space, just separate it into two parts and it will work…
so change this: ['omxplayer', uri, '--vol -600']
to this: ['omxplayer', uri, '--vol', '-600']
by the way, that -600 is going to make a very small difference, i tested and for me to get lower volume that is noticeable i had to make it -2000