David Thiel did the sound for Secret Service and Torpedo Alley and has done recent stuff for JJP. Try reaching out to him.
You might find the data sheets for the audio chips useful. The schematic for Time Machine shows Yamaha YM3012 and YM2151.
http://www.ionpool.net/arcade/gottlieb/technical/datasheets/YM2151_datasheet.pdf
https://www.datasheetarchive.com/pdf/download.php?id=4dd2ad957275a76074d8a7236f1f09d3646083&type=M&term=YM3012