I'm not familiar with the 33, sorry. I used a Yamaha Tyros and when I needed to use a VSTi, I would record the part using the Yamaha Midi Driver in Biab and then switch to the VSTi check box for the playback sound. I got tired of fighting the latency issue in real time, so switching back drivers worked for me here.

Some keyboards have "modes" that they use and send midi set up data etc. Does yours have a "performance" type of set up mode for working with midi sequencers?

Trax