Like my other sound boards, I am creating a custom sound board for Bally Supersonic. Here is a first try video. I have the stock sounds and one of the background sounds working. The sounds are all WAV files on a MicroSD card. They are grouped together into sound events instead of the 32 individual notes of the stock sound board. This allows you to modify the sounds easily. The start game tune is 10 notes long. For my board, the start tune is one WAV file.
Next steps are to get the EXTRA sounds working. When the EXTRA (middle) mixing knob is turned up, EXTRA sounds take over the tunes and solenoid fires. This is shown in video #20.
Watch my website for the latest information.
geeteoh.com/supersonic.shtml
I already have custom sound boards for this generation of Bally machines - Star Trek, KISS, and Lost World. They are for sale on my website.