Based partly on Brent's thread here... It seems to me that when rendering midi to audio you only want audio where midi is, otherwise it's a waste of space, and time. Here is an example of what I consider a good result. Every host does this a little differently but the result here (imo) is the correct result. Here it's just selecting midi regions and hitting CTL+B to bounce VSTI to audio... So the FR is to only render audio only where midi is. Of course in Reaper the audio would be put on the same track I guess... but then again, there may be issues there with FX getting doubled up.