Only able to interpolate values in the delay and fx column?

Hello! I bought redux today. I am having trouble interpolating values in the panning and volume columns. I start with 10 and end with F0, Select using ctrl b and ctrl e, and press ctrl l or e, but nothing happens. It doesnt work when I right click on the selecting and press interpolate from the drop down menu. I am able to interpolate values in the delay and fx columns, however.
What am i doing wrong?
any help is appreciated, thank you!

Volume and pan values go up to 80, not FF. Interpolation will not work if the beginning and end values are outside of the range.

Got it- I figured it was something simple like that. Thanks so much for your help!