HxC Floppy Emulator for CDTV, cannot get DF0 and DF1 working

[CDTV1991]

I have a Commodore CDTV and a HxC floppy disk emulator. I've got the single disk (DF0) set-up working well, but I have to use the buttons to swap disks when prompted. I can't seem to get a second disk drive "Drive B" (DF1) to work.

The HxC is connected to the "controller board" that I took out of an old Amiga external floppy drive. The external floppy controller is connected to the CDTV via the floppy port at the back of the machine.

The main question is can the HxC operate two drives (A+B) from a single external floppy drive interface? Has anyone done this before or even got two drives working when connecting internally?

I can see that most HxC users are connecting directly to a machine's internal floppy drive connector, whereas I am connecting to an external disk drive's interface.

Do you think there is something wrong with my HxC set-up or configuration that would prevent drive B (DF1) from working or just that it can't have a second drive running off an external disk drive controller board?

Pics are in http://eab.abime.net/showthread.php?t=61244

Thanks

(I've also posted this on the HxC forum)