Welcome to my program :)
Flags:
-r R Default: 8192 Fft bin size. Generally increases note count for small gain in lower notes, also increases processing time.
-c C Default: 32 Number of midi channels.
-o O Default: 0.75 Overlap between fft bins. Increases notes per second with higher numbers. range 0.0 to 0.99.
-i Interpolate missing notes.
-m If the input file is mono enable this flag.
Basically requires the soundfont to be used
Tuned for fluidsynth with chorus and reverb off. (if that changes anything?)
Example: https://youtu.be/sd0vAzpcplY