The CD is master on second channel, so the mountlist should be CD2 on 2nd.scsi.device.
Erm, I am not exactly sure now but I think this is not true. I think the device is always the same for both channels and the unit numbers are like this:
first master = 0
first slave = 1
second master = 2
second slave = 3
So if you have only the FastATA controller it is scsi.device unit 2. If you have a drive on the internal IDE bus (which is scsi.device, too), the FastATA becomes 2nd.scsi.device and the second master is still unit 2.
And if you have both a Commodore SCSI controller and an IDE device, the FastATA might become 3rd.scsi.device.
This is the reason why I told you to use FindDevice. It does not only tell you the unit number but also the driver name. It's the best way to be sure.
Bye,
Thomas