Gentlemen:

Thanks for the workaround.

However, here's what I'm still not grasping--

If I do what Rachael suggested: right-click drum part and save as WAV and then import the WAV file in RB, the WAV indeed plays the Celtic drums and then the Tango beat just like in BB as per the F5 screen. Why should opening the MGU file in RB not yield the same results? I'm still mystified.

Percy