DYO: Use 4 colors for 4 percentages on volume

Q: I want to display 4 different colors depicting 4 different percentage levels of volume. Hope you can help me. :)

A: Try something like this to have 4 different colors for 4 percentage levels of volume.

Line A determines a maximum value from the last 50 volumes to use as a divisor to create the percentage on Line B.

Lines C through F select a color for the block marker based on the percentage stored in Global Variable [2].