Having trouble using the ROUND function.

[Bob G]

I’m writing an eval script that grants a 5’ bonus to base speed. This ability scales with level. The first 5’ bonus is granted at 1st level, and then again at every 4 class levels (i.e. 4th, 8th, 12th, etc.)
The script I first came up with was:

field[abValue].value += round(field[xTotalLev].value / 4, 0, -1) + 5

It worked for 1st level (changed 30’ speed to 35’ speed), but at 4th level the speed became 36’. So I changed the script to:

field[abValue].value += round(field[xTotalLev].value / 4, 0, -1) * 5

This worked at all levels except 1st.

Then I thought “What if I round up instead of down?”:
field[abValue].value += round(field[xTotalLev].value / 4, 0, 1) + 5

This resulted in a +6’ movement speed at 1st level.

field[abValue].value += round(field[xTotalLev].value / 4, 0, 1) * 5

This resulted in a 5’ increase at 1st level, but no increase at 4th.

What is the magic formula to make this work?
Thanks^7