I am not at my gear now. If no one else has the answer, I can look into this on the weekend.
I thought triggers were recordable, but I will have to double check. A workaround would be to record the bts pattern. A more cumbersome workaround might be to use embedded sysex--but if there's a more direct method, I'd recommend that.
Maybe someone else can spell out the direct steps if its possible. If not, I might have enough of a brain left this evening to give it a test.
Steve