Those who want to look at some XG-MIDI files, one zip-archive of a few dozen
files is here:
psrtutorial.com/songs/Yamaha/XGCurrent.zip
Not all of them use multiple drum channels, I din't look through all of them,
but here are a few within this archive which use 2 drum channels:
YamahaCurrent/Dance/Lost YME '97.mid
YamahaCurrent/Dance/Ambient by Sam Sketty YME '96.mid
YamahaCurrent/Dance/Matrix YME '97.mid
YamahaCurrent/Dance/Cop Out by Sam Sketty YME '96.mid
YamahaCurrent/Dance/Space Cat by Sam Sketty YME '96.mid
YamahaCurrent/Dance/Galactic Invasion by David Reading YME '96.mid
YamahaCurrent/SmoothJazz/Low Down by Sam Sektty YME '97.mid
YamahaCurrent/SmoothJazz/Steely by David Kelly YME '96.mid
YamahaCurrent/SmoothJazz/Animate1 Yamaha '96.mid
YamahaCurrent/Latin/Farolillo Yamaha '96.mid
I believe this one setup drums on 3 different channels:
YamahaCurrent/Dance/JazzJung Yamaha '96.mid
Make sure you run FluidSynth in XG mode with:
-o synth.midi-bank-select=xg