Hi. I am not sure if I understood your problem, so sorry if this is obvious. If you do hear sound when playing (notes inserted, but not when playing your controller keyboard), maybe try to change the MIDI channel from OMNI to channel 1 (if they are single channel Vsti's)? Are you using Simple Instrument tracks, or separate MIDI and audio tracks? If using SI, maybe try to split to separate tracks (right click and choose split tracks? If this is not helpful, I hope someone else will come to the rescue

Best of luck.