* FluidSynth sources are in `libs/fluidsynth/src` and `libs/fluidsynth/include`.
* `libs/fluidsynth/fluid_conv_tables.inc.h` and `libs/fluidsynth/fluid_rvoice_dsp_tables.inc.h` are generated files copied from a fluidsynth build.
* `libs/fluidsynth/glib.c`, `libs/fluidsynth/glib.h` and `libs/fluidsynth/glib/gstdio.h` (empty) are plumbing to implement the Glib subset, that FluidSynth needs, using Win32 primitives.