Since you can't buy the cascade cables anymore you have to roll your own. These are the pinouts required on a standard DB25 connector.
If anyone is interested I sent this pinout to "Black Box Network Services" in the UK along with £76.80 (inc post and VAT). They built me a 1.5 meter cascade cable and it's working great.
It's not a standard DB25 cable and $80 is a steal next to my best quote of $170 provided that it is done correctly.
You buy a standard cable and only have to resolder 9 wires. Dude. What kind of audio guy are you? - W