An effect with negative colors and invert hue with the pitch +8
Klasky Csupo in G Major 1
A effect with low threshold and the pitches 0 and -6
G Major 6 is too dark.
A Effect with the cyan-ish negative colors and with the pitches 0 and +5.
G Major 5 looks similar to G Major 2.
I call this "the people's key". It's a common key used in folk music and ballads. It's also a simple key to play in.
Songs in the key if G Major:
Good Riddance (Time Of Your Life) by Green Day
Let Her Go by Passenger
Maybe It's Time by Bradley Cooper
Wish You Were Here by Pink Floyd
Knockin' On Heaven's Door by Bob Dylan
An effect with yellow-ish negative colors with the pitches 0, +4, and -5