I have 900 classical songs found in Pianist a selection of about 900 classical pieces that I am interested in converting from midi to audio.  I discovered I can represent between 1 to 900 using 30 pieces of paper to randomize which pieces I will select.  I want to use Arturia Piano V but I discovered it is only outputting in midi.  How do I convert the track to an audio file so I can put reverbs or chorus on it in X3?  Thanks in advance

Insert Piano V as a synth, and route the MIDI track to it.
The MIDI information feeds the synth, which then outputs audio back into Sonar.
Then you can add whatever FX you like in the FX Bin of the audio track.

You freeze the synth.