Early arcade games used analog audio tricks that chips cannot perfectly replicate. If games like Donkey Kong or Galaga lack classic explosion or jump sounds, you need to download a "MAME 0.119 Audio Samples" pack and place it into MAME’s samples folder.
To understand the hype, you have to look at the state of emulation in 2007.
Many older custom arcade cabinets rely on fixed, older builds for long-term stability.
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Downloading individual ROMs from random websites often leads to "Missing Files" errors because modern sites host modern dumps. To ensure compatibility, you must search specifically for a "MAME 0.119 Full Reference Set." Managing Files with Clrmamepro