Sorry, goofball, that's not a schematic - there isn't enough information there to really tell how it works, and that's probably their intention.

I can tell you that pretty much every amp I've ever owned used mono inputs (that ranges from a Marshall down to the little 60 watt Peavey I use these days), and the only equipment I've had that used stereo patch cords was a mixing board. A variety of cables are available, of course, to let you plug into anything you want.

Stereo vs. Mono cables are simple to tell apart - the mono plugs will have one black insulator band below the tip, while stereo plugs have two. The electrical difference is that stereo cables have two signal outputs and one shield ground, while mono has only one signal and one shield.

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