I feel very fortunate to have found this forum. Thanks for the kind help.
When I check what I take to be the Midi Mapper (Control Panel, click on Multimedia) it displays:
ESFM Synthesis (DC00)
ESS MPU-401 (400)
with a little branch off the bottom term saying "Percussion on Channel 16"
Duh...
Using Power Tracks, I can record drums onto a track -- at least I see them on the notation screen -- but I can't hear them. Do I have to have a drum machine to hear what I am recording on a MIDI channel? Somehow I thought my sound card would do this for me.