Made these a long time ago to help me with a fault. They are far from perfect and it doesnt really cover a lot but it may help someone.
Zabanitu has sent in his own schematic of the sound section from a Cadash board. He also says it applies to a Rainbow Islands board too (with a couple of minor differences).
Thank you very much to Zab for this. Hope it helps someone out one day.
Taito Sound Schematic Download