Hey, no problem--so by default the strumming pattern keys are from C-1 to B-1. When you load a pattern, you should see a keyswitch appear there. In order to play the pattern, hold down some notes in the main playing area, and then hold down the pattern key. There are three chord modes available in the "Performance" / "Chords" section (the "Chord Mode" control). The first is "Disabled", which means that it'll just strum the notes you have held exactly. The next is "Held Notes", which works very similarly, but you won't hear anything from playing on the main playing area. That's helpful if you want to hold down some notes first, without having them sound, and then use the pattern key to actually play those notes. The last mode is "Auto Detect", which also bypasses the playing range, so you can hold down chords which will be recognized and translated into full guitar voicings. Hope that all makes sense!