FX not rendered

[agear]

Hello,

I am using sf2_loader to render .mid files to audio but it is not rendering with any effects:

=> python3
Python 3.9.18 (main, Aug 24 2023, 21:32:41) 
[Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sf2_loader as sf
>>> loader = sf.sf2_loader("/Users/admin/Desktop/gm.sf2")
>>> loader.export_midi_file("/Users/admin/Desktop/reverb.mid", name="reverb.wav", format="wav")

When I play back the exported "reverb.wav" file, there are no reverb or other effects on the audio. However, if I use VLC media player with the same "gm.sf2" as the audio output codec and playback "reverb.mid" (or use VLC's "Convert & Stream" function to save "reverb.mid" to "reverb.wav"), the file does have reverb indicating that the "reverb.mid" file is using MIDI CC 91 to send the track to reverb (which I have confirmed in my DAW) and also that the "gm.sf2" SoundFont file I am using can produce a reverb effect. Is there some additional parameter that I need to pass to the sf2_loader object so that it correctly renders effects? Or is this a bug or missing feature? Thanks