I've seen all the many sound ROMs that are available for download at IPDB. Wild guess here: they are provided this way for burning onto programmable chips, to be used as replacements, when needed for various games ?
Being a video enthusiast (as well as a pin addict), I could tell you a couple easy ways to extract specific clips from much larger video source files. Is there some way -- maybe using something like the software Audacity ? -- that one could extract specific pieces of dialog, or specific sound or music cues, from these downloadable ROM files ? If so -- in some basic detail -- how would I go about doing that ?