on Halion 1 and EZ drummer. IT WORKED FOR 10 MINUTES I had to step away from the computer for a short time and when I sat back down again the midi led input still showed but no sound from either instrument. EZ drums sound from interface and track midi but not from live keyboard .
I wanted to add that the Cubase Virtual Keyboard does not trigger any audio on the instrument tracks either. But I can still hear the instruments from the EZ Drummer interface with mouse clicks on the percussion images.
“MIDI thru active” active?
Good Grief - It is NOW 
Thank you SO much!