I'm curious as to where they are gonna get YM2151 Synth chips to make these. I don't believe Yamaha makes them anymore. That said, FM synthesis is digital, so it is possible that an emulator could produce the musical tones, similar to how pinmame does it.
Also, it looks like they are completely redoing the audio for the game... new voice actors, re-recording sound effects... Kind of slap in the face to the original sound designers don't you think? I'm all for a repro WPC sound board, but this seems to be taking a bit too far.
There's something wonderfully elegant about the system 11 and early WPC sound systems that would be impossible to emulate with ripped mp3's of the original audio mixed in with re-recorded speech/sfx...
-BB
PS - Are they seriously replacing Raul Julia's voice??