I remembered it correctly. Here is a relevant post from Peter Gannon from January 14, 2016, regarding a problem reported by Trygve Larson:

A slow PC could cause this. If this is the case, disabling fast generation of RealTracks would diagnose (and fix it). You can do that from Prefs-RealTracks - Speed up Generation of RealTracks - set that to NO.

If that fixes it, it will take longer to generate the song, but the whole thing will play. And you could test the speed of your PC by doing a geekbench ( http://www.primatelabs.com/geekbench/ ) , and telling us the single core speed. Anything about 2,000 should be fine. If this is the case, the songs that would be most troublesome would have lots of RealTracks, lots of chord changes, and be tempo stretched higher - all on a slow PC (slow CPU and/or slow Hard Drive)


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