Other than that I think, IIRC the A1200 can only recognize one IDE device.
The A1200 has a full-featured IDE port which can handle up to two devices (master and slave). The buffered interface gives you another two, so you can use a total of four drives.
The best one looks like the IDE fix express for the A1200, it lets you add up to 8 devices (not sure if its all at once).
The Powerflyer and the IDEfix-Express do allow "only" four drives, too, just faster than the simple buffered splitter.
well it did not work.
Why the CF adapter does not work can have several reasons. "Did not work" is not an adequate error description as well as "CF adapter with two slots" is not a sufficient description of the device. If help is wanted, we need much more detailed information.