JJ OS2 - Mute Groups - High Hat Choke

I am using JJ OS2 and have already checked the online manual for this function.

I want to do an a high hat choke where one pad mutes another (i.e open and closed high hat),

Previous versions of the OS had mute groups but I can't find that function in OS2.

Can someone let me know if this function exists or if there is a workaround in OS2.

cheers.

GPE (Mode + Pad7)
Mute (F5)

http://www7a.biglobe.ne.jp/~mpc1000/os2/gpe_e2.htm

Thanks for that.