Scan Library
Point it at your sample folders, several at once if you like. It indexes .wav, .aiff, .mp3, .flac, .ogg, .m4a, .wma, and .aac, reading duration, sample rate, channels, and BPM from each file's metadata and name.
Indexing, not importing. Your folder structure stays exactly as it is. Exact duplicates are detected by content and hidden automatically, never deleted.