Open "_fSetValue", click on the first Action "Catch Linear, timeout touch".
Click on "Copy" button (on the right).
Change to "HP slope", click on the last Action "Call ((None)) _fSetValue". Click on "Delete" button.
Click on "Paste" button (so, you have replaced the "Call" with "Catch Linear").
Keeping pasted Action selected, check "Reverse" box (at the bottom).
I think "Fine tuning" (with Shift) is not interesting for this parameter, so I have not copied it.