I stumbled onto the following interesting paragrah in the BARFLY documentation*:
"A BETTER SOUND
There are hundreds of musical instrument sounds available through Quicktime. Under the Play menu, go to the Instrument sub-menu and choose Add an Instrument. The Irish reel above was transcribed by Henrik Norbeck, who plays the flute, so let's install that instrument first. In the instrument picker dialog, choose Quicktime Music Synthesiser from the top popup menu, Pipe from the Category popup and Flute from the Instrument popup. You can try out the sound of the instrument on the keyboard at the bottom of the dialog. Hit OK. Look at the Instrument sub-menu again. It should now contain Flute, and that item should be checked. Now play the tune again. You can install as many instruments as you like on the menu, but if you add too many it gets a bit cumbersome. To remove an instrument hold down the option key while you choose its name from the menu. (You can't remove Acoustic Grand Piano, as you need at least one instrument on the menu.)"
*BarFly interprets ABC notation files for Macintosh, and will play them and display sheet music.
So I've added a percussion instrument, and for the moment selected "Taiko Drum"; we'll see how that works. There are other choices as well, including "Woodblock", which might help me learn bodhran drumming patterns. And there's a whole other category of "Chromatic Percussion" which includes Celeste and Marimba; and a section of "Special Effects".
So far, the Taiko Drum setting seems to meet my needs. -- Rachel Holmen