Sound through SPDIF & Line-Out simultaneously?

I play movies on my PC using a monitor or a TV as a display
device. Depending on display used, I have to select "Speakers" or
"SPDIF" as my default sound output device. Is there any way to
run sound output on both "Spdif" and "Speakers"? Because
currently I often have to change default sound device (between
Spdif/Speakers).
Maybe this goal can be achieved by using some program/driver
(favourable way), or using other movie player, or other sound
card (least prefereable) ?
My PC has motherboard Asus P5E with SPDIF on board, and boudled
PCI-E sound card, which is SoundMax/SupremeFX II (with
Speakers/Line-out). I use player "Media Player Classic" from
K-Lite Mega Codec Pack. OS is Vista Home Premium.

Regards,
Mark