That’s not being rude, that’s being ignorant.
I’m not a developer, that’s why I gave you the github of the main project. In the first message, right?
If the MIDI is out of tune it’s because you have the ports configured wrong.
Soundfont/Sound canvas are not polyphonic, they are waves, you should NOT have any problem playing waves even if you change the MIDI channels but if you change the channels on the host system you can create a conflict.
Who knows what you did, or what program you installed.
I use linux, and if I activate low latency, I have to reconfigure midi.
@GemaH Please remember that SC is copyrighted, there are many free .sf2’s that can be shared.