Hi,
I'm having troubles figuring out how the buttons on my Guitar Hero controller works. I'm guessing its a voltage divider / resistance ladder, but I just can't wrap my head around how it works.
I've taken a few pictures and made some measurements. Hopefully there's a smarter person on this forum who can nudge me in the right direction 
Buttons Colors
1 Â Â Â Green
2 Â Â Â Red
3 Â Â Â Yellow
4 Â Â Â Blue
5 Â Â Â Orange
Measuring between pins:
1, 2
Resistance change depending on multimeter settings.
200M = 1.1M
20M Â = 4.09M
2M Â = 803K
200K = 140K
20K Â = No reading
Reaction when buttons pressed:
1
2-3-4-5 // I hold all buttons down at the same time to get the same reaction as just pushing button 1//
Measuring between pins:
1, 3
Resistance change depending on multimeter settings.
200M = 1.1M
20M Â = 4.09M
2M Â = 803K
200K = 140K
20K Â = No reading
Reaction when buttons pressed:
3
4-5
Measuring between pins:
1, 4
Resistance change depending on multimeter settings.
200M = 1.0M
20M Â = 20K
2M Â = 20K
200K = 20K
20K Â = 19.98K
Reaction when buttons pressed:
5
Measuring between pins:
2, 3
Resistance change depending on multimeter settings.
200M = No reading
20M Â = No reading
2M Â = No reading
200K = No reading
20K Â = No reading
Reaction when buttons pressed:
Measuring between pins:
2, 4
Resistance change depending on multimeter settings.
200M = No reading
20M Â = No reading
2M Â = No reading
200K = No reading
20K Â = No reading
Reaction when buttons pressed:
Measuring between pins:
3, 4
Resistance change depending on multimeter settings.
200M = No reading
20M Â = No reading
2M Â = No reading
200K = No reading
20K Â = No reading
Reaction when buttons pressed: