Attack Curve vs Fast Decay

Hi,

Was just looking at a Sub37 editor screenshot and noticed a feature called Attack Curve which chooses between LIN/EXP attack curve. I didn’t, however, see the Fast Decay switch the Sub Phatty has.

I assume these are both different functions but is there a reason why the SP has the Decay and the Sub37 Attack functions but not the other way around?

Cheers