Problem with external mixer

I have just reinstalled MixVibes DVS and I cant get my external mixer to work. I also noticed that under "Options" sound tab, there is nothing about mixer, there should be a way to select mixer I think? When I look in the manual bothe Multichannel, Asio and Kernel settings display a mixer selection option. Why dont I have that?
best reagrds,
Fredrik Hagblom
best reagrds,
Fredrik Hagblom