Hi John, thanks for the reply!

As I stated a couple of posts back I have no problem rendering the audio file if I use the VSC DXi, that works fine, the problem is when I use the NI Bandstand synth.

Made a bit of progress with this with help from support, instead of using the DXi version of the synth they suggested I use the VSTi version. When I select the VSTi version of bandstand I can render the audio track correctly, however with the VSTi synth selected Realband crashes everytime I restart the program, so I have to start it using the system defaults. So one step forward two steps back! Also lots of static when I move the mouse during playback.

I think it's a bug in the way Realband handles NI Bandstand, because as I mentioned before I use Bandstand all the time with BIAB and it works great.