Clone mode with multiple frequencies

Hi All,
I'm using a an ATI Radeon 9800 Pro card on a Windows 2000 machine.
Basically my problem is that I can't achieve a simultaneous analogue
and digital output of the same screen region with different
frequencies on the two outputs. ie. let's say I need 60Hz on the
Analogue output and 75Hz on the digital for example.

If I select the 'extend my desktop...' option, then I can set the
output update frequencies ok, but obviously the display show different
things. Alternatively, if I select 'clone' mode so that both outputs
show the same image, it appears that it's not possible to set the
frequencies of the two output independently.

Does anybody know whether this card support sthis mode of operation?.

Any comments or suggestions gratefully received.

Ta,
Dave