DAW 32 Bit = Nebula 32 Bit DAW 64 Bit = Nebula 64 Bit
That's OK, but if you have a x86/x64 bridge you can use it. We test JBride and works with Nebula. Bridging Nebula x64 to Cubase x86 able you to user more that 4 GB of RAM and at the same time you can still use your all x86 VST plugins.
Enrique Silveti. Acustica Audio customer and technical support.