I've had a PEDL-91016 footswitch on backorder since August.  Can someone provide me the schematic to switch the master volumes?  That's all I really want from the switch anyhow.

I'm to the point where this feature was the only reason I bought the amp, and I've not been able to get the footswitch to use it.  I do love the tone, but I'm kinda done waiting on it now that I hear it'll be April.   This is really my first Marshall purchase, I'm not sure I'll purchase a new product again at this point.