DDJ-1000 Edit Beat FX

Hi. Wanted to know if its possible to edit the strength value of effects such as Reverb to lets say 35%. Stock values (for Reverb) are 10%, 25%, 50%, 75%, 90% and 100% respectively. I had messages on other platform stating holding down shift and using the arrow keys does it, but to no avail. One message said you have to use an editor.

Ideas?