Modify jump

What scripts are involved in the players characters jump physics? I change jump hight from 6 to 5. But I really would like something between that. And 5.5 wasn't a valid value.
I would also like to experiment with jump speed and possibly gravity.
I'm sure it's easy to find but with much going on in life I thought I could save some time by asking

You could try adding a value to Object_v_speed_lo in addition to the Object_v_speed_hi that is already in the script. Think of Object_v_speed_lo as being sort of like a decimal value. Off the top of my head I can't remember if lo is also interpreted as a signed (positive and negative value) like Object_v_speed_hi is. I don't think it is, so a .5 value would be $80.

Its not going to well- last week , this week good score but foul jump