SBLive cards have historically had bad audio latency issues in general. There were 3rd party drivers you could get that addressed them. They made quite a difference to softsysnths too, which is probably the reason I had them in the first place.
Creative did, for some reason, have monumentally bad drivers! I too had an old SBLive! and had to use some 3rd party ASIO drivers for my softsynth work.
