Yep. On the same loop is no problem.  Thanks.  Just as with DCC, TMCC, Legacy, DCS, and other constant track voltage systems I'm familiar with.  I didn't need to put it that way but chose to for some reason.  Your first reply was not a waste of time. Now I know that when in a consist the sounds of the lead E-Z App engine are what you hear on your BlueTooth device or whatever you might have that also paired with such as a Bose Mini. Still wondering what you hear when two or more E-Z App engines are run separately at the same time.   

Thanks.  I'm assuming you mean when running engines in a consist that you'll hear the lead engine.  That's good to know, but I meant when running more than one engine not in a consist with each other -- say a 2-6-0 on one loop and a FT A-unit on another loop.  Do you hear a steam engine and a diesel running simultaneously, just one at a time, just the one you most recently did something with like changed speed, sounded the bell, etc,?  

If you're running more than one E-Z App engine with Multi-Train what sounds do you hear?  Do you hear one engine at a time (e.g. the last engine you changed the speed of or sounded the horn, etc.) or all of them at the same time?  Thank you.