Yes there is! But I never documented it. Here are command lines to run in a powershell that convert from sf2 to sfz and from sfz to sf2:cd C:\Program Files\Polyphone
.\polyphone.exe -3 -i C:\Path\To\Your\Soundfont.sf2
.\polyphone.exe -1 -i C:\Path\To\Your\Soundfont.sfzYou can set the output directory with "-d" and the output file with "-o".
-1 is for a conversion to sf2
-2 is for a conversion to sf3
-3 is for a conversion to sfz
I'll create a page in the documentation for the command lines.