View this is a youtube video demo of the Valve Junior with a Marshall™ Mini Stack and the description of a Speaker Patch Box. The demo music is an abbreviated version of my best recollection of a song (Cover of Ray Charles’ “What’d I Say”) from the Rare Earth Live album that I had when I was a kid. The album looked like a green backpack if I remember correctly.
The details of the Speaker Patch Box can be found on the Speaker Switch Page.