Historically, "KaraFun 12 Full Packs" or similar collections were distributed as zip files or torrents containing roughly 3,000 tracks in KFN, CDG, and MP3 formats.
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Most files use the proprietary .KFN format, which allows for adjustable backing vocals and high-quality midi-based or studio-recorded audio. Historically, "KaraFun 12 Full Packs" or similar collections