When I bounce a soft synth or GA1 track to audio, sometimes it takes several tries before it will record (I get a blank clip sometimes). I usually bounce by using an output that is not connected (midi output to phantom output and audio input from phantom output) and I cannot find a common denominator to the problem when this doesn’t work. It also happens when I export and import the audio. Any ideas? 
Here’s two or three ways to get the job done!