Thanks for the reply.

Doesn't work - I did the combine, (combinator appears) but the second track still does not sound. I went around to the back, and the 2nd nn-xt is not patched anywhere. The first is patched to the combinator, but the 2nd isn't. The only way I can patch the 2nd, is by removing the first - I can not get both simul. The combinator only has one set of inputs - so where does the 2nd nn-xt go?

Tahnks again.