Cubase 4 or 5 will do this. I do it often now with version 5 on my MDD. Oms will automatically publish a virtual port for each VST which Logic will remember when saved, such as Kontakt v1, v2 etc, so you need not bother with the Cubase arrange window to access them, just select the virtual port in Logic's instrument assignment menu . Latency with Sound Manager is not great, 25-30ms. Oasys card gets 4-8ms but Cubase is fussy with it. No problems with Sound Manager. Launch Cubase first, then Logic. Apart from Cubase I run Unity DS-1 engine, a fantastic stable partner to Logic, which likes the Oasys card, and even feels tighter than my hardware racks latency-wise. (I wish I could find Unity Session somewhere, as it had disk streaming)