Does any have an explanation of what the general idea behind the differences is? There are lots of amps which have some or all of these, and ofcourse I hear the differens but is there some explanation so I can make sense of the toughtprocess 
? Dunno how to google this.
What are you talking about?
Green, blue, gold and cream are colors of celestion speakers.
Green - hyped mids
Blue - Can’t remember (but I have one in my Matchless)
Gold - transparent and clear
Cream - vintage, dirty, but somewhat scooped
Green/Blue, orange, and red LED’s are typically used to identify channels, progressively from clean, to crunch, to high gain.
I think I found the answer while looking for an example 
Its what you are saying actually. Its the preamp circuit I was talking about it seems.
Scroll down a bit.
How should I google this to know more about this cause I’m not getting much luck. Not sure how to put the question down in google, my english is limitted.
I don’t think there’s any standardized meaning to the colors on that thing. It’s more a limitation of the physical interface, and colored LEDs were the easiest way to give some sort of visual feedback.
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Could be just that indeed. Just wondering if there is some consistency 