Converting .mp3 files to .sf2 format.
Converting MP3 Audio Files directly to SoundFont 2 Sound Banks (.mp3 to .sf2 conversion) should be possible, even though your options are very limited.
Try using an audio editing software or (online) conversion tool, such as MuseScore or FL Studio, which should allow users to import MP3 audio files and export them in SF2 format.
A popular virtual studio used to create songs and loops
A free cross-platform music notation software
A set of software tools for audio production
A program for fast editing of sampled parts, chopping up riffs, remixing and doing mash ups