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Using the "Heroes IV Resource Explorer" and "Mod Maker" programs! I extracted all the music files in MP3 format from music.h4r using the explorer, replaced the corrupted ones with new MP3 sound files with the same name. I used music from Heroes 5, first converting OGG to MP3. It turned out great, and I plan to continue experimenting! I'll try inserting music from Heroes 3. I'll listen to how it sounds.
