Thanks Eli,
I realized after I'd written, that I could do a search for "gong" on the computer and I did find a usable gong in Jam Pack Asian kit but I did have to experiment to get access to it.
I don't have to remap it currently but when I get into the score window, that will be a headache. (Yes, I see nice and complicated directions in the manual!) So far I've been avoiding notation in Logic having quite enough on my plate with everything else.