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Thank you very much for your suggestions, Rui. I still haven't figured out the difference in behavior on my two computers (the older Cinnamon runs the Fluidsynth-DSSI plugin nicely, the newer Xfce doesn't), but I'll keep experimenting by following the leads you kindly supplied. I'm fairly new to the Linux world, but do enjoy learning and am always up for some detective work.

In the meanwhile, here's a work-around in case anyone else is having a similar problem. I stumbled upon the Ardour-LV2-Plugins in the Software Manager. It includes a fluidsynth module which works very well in Qtractor. In particular, it opens up with a panel letting me set the soundfont to be used.

So, with this, I'm back in business. As a recap, on one of my computers Fluidsynth-DSSI doesn't let me choose a soundfont. But the Ardour supplied LV2 one works just fine instead.

And while I'm at it, a big thanks, too, to you Rui for all your hard work on Qtractor! It really is an excellent program, easy to use and producing professional results. I truly appreciate your generosity in sharing it with us all.

Thomas Henry