FunctionFlip doesn't work. Alternative/fix?

I am on OS X 10.9.5 and recently (can't remember if this happened during 10.9.4 or not)

FunctionFlip has started to work very inconsistently for me.

Basically I use this to enable the F1-F10 keys for use in terminal (and some of them I set to do stuff like next/prev. tab e.g. in web browser) and I used FunctionFlip to generally enable the volume control keys so that they work globally.

But lately it's just not been "kicking in" so it's hit and miss every time i try to change the volume.

Solution 1:

I got tired of FunctionFlip not working right and finally found Karbiner does exactly what I want and works great.

Solution 2:

Fluor is a relative newcomer to this space. I'm not sure if it's exactly what you want because it doesn't allow you to assign the functionality on a per key basis - it's either all F keys or all apple functions:

Fluor is a tool that allows you to automatically change the behaviour of the keyboard's fn keys depending on the active application.

But it is open source, works on macOs Sierra and is actively developed (as of March 2017).