The .sf2 file extension is most commonly used for SoundFont 2 sound bank files. These files define a group of audio samples (commonly referred to as a patch collection) that are played back using MIDI data on a user's computer. The SF2 file may contain loops, envelopes, layers, instruments and other sound bank information. The SF2 file format is commonly used to save custom patches and software instruments.
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If you have additional information about the SF2 file format or software that uses files with the SF2 suffix, please do get in touch - we would love hearing from you.