If you desire to hear the Cabinet Emulation feature of the ME-80, the following are the options you have when connecting to a PA system:
RECORD OUT jack:
Connect the ME-80's RECORD OUT jack directly to a PA.
Guitar AMP OUTPUT jacks:
If you insert a dummy 1/4" plug into the RECORD OUT jack, it will activate the cabinet emulation on the Guitar AMP OUTPUT jacks as well, for use with a direct connection to a PA.