Williams System 11: Harris CVSD format (no decoder for this)
Williams WPC 89: Harris CVSD format (no decoder for this)
Williams WPC DCS: Digital Compression System format (no decoder for this)
Data East System 2: 8kHz 8-bit PCM, maybe ADPCM sound bytes as well
Data East System 3: 8kHz 8-bit PCM and proprietary 4-bit ADPCM (no decoder for this)
Data East/Sega System 3b: ~22kHz 8-bit PCM, maybe ADPCM sound bytes as well
Sega/Stern Whitestar: 8kHz 8-bit PCM, maybe ADPCM sound bytes as well
Gottlieb System 3: 8kHz 8-bit PCM
Stern SAM: ADPCM I believe, can be decoded with Stern Pinball Browser
JJP: 44kHz 16-bit PCM, now encrypted in latest updates
Chicago Gaming Company: 32kHz 16-bit PCM