When you append "Extra Quality" to your search, you are demanding four specific technical criteria:
While free SF2s exist, the absolute best quality comes from commercial libraries that have legally licensed (or painstakingly re-sampled) the SC-88 Pro. Expect to pay $30-$50 for a "Gold Edition" SF2. These often include release triggers (the sound of a key being lifted) and round-robin sampling (alternate samples to prevent the "machine gun" effect).
Most free SC-88 SoundFonts available online suffer from three fatal flaws: roland sc88 pro soundfont extra quality
"Extra Quality" solves these issues.
Several archivists have used auto-sampler software (like Extreme Sample Converter or Chicken Systems Translator) to record every note of the SC-88 Pro at 24-bit/96kHz. When you append "Extra Quality" to your search,
A lesser-known but technically superior pack. This source focuses on "Extra Quality" by removing background hiss using spectral editing. It is favored by professional trailer composers who need the 90s cheese factor without the tape hiss.
There are several versions floating around the internet. For the "Extra Quality" experience, you are looking for specific file names. "Extra Quality" solves these issues
Target Filenames:
Note on Legality: Roland ROMs are copyrighted. You generally need to own the hardware to legally possess the ROM dump. However, these files are widely preserved in the retro computing community.