rosegarden: what are rgd files really for?

[pradagio]

in my ~/.local/share/rosegarden/library
there are a lot of rgd files (one of them being an updated yoshimi.rgd that i created to match intruments properly).

i can see that the yoshimi.rgd was necessary as a roadmap to the yoshimi synth.

however, there is also GM.rgd, GM2.rgd in there which maps the instruments, but i don't understand what it's purpose is since with /etc/timidity/timidity.cfg i have:
soundfont /usr/share/soundfonts/default.sf2 --> FluidR3_GM.sf2

with this setting, everything works fine.

so why would anyone want to import the banks from GM.rgd or GM2.rgd anyway?

i presume that all the rgd files are doing is to 're-arrange' the instrument numbers for some reason or build banks that contain smaller/larger instrument sets? however, i don't really know.

[Kirtai]

They're General MIDI maps, and FluidR3_GM.sf2 is a GM soundfont.