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Sure thing. Here are some details. Please let me know if you'd like to know anything else:
* 48 Hz, 24bit
* Hardware: Steinberg UR22, ASUS N55SF i7
* OS: Ubuntu 18.04, 4.15.0-50-lowlatency
* Two tracks: MIDI and bounced audio
* Chain: Carla Rack > Dimension Pro 64bit > Master Out (default)
* No FX

Of additional note:
* The full project has many more tracks, but I saved as a new project, removing all other tracks in order to try to identify the source issue - I could still hear some timing that was not quite right
* I previously worked on this at 96 Hz. There were LOTS and LOTS of xruns, but bouncing MIDI to exported audio (new audio track) did not produce any audible irregularities with timing
* As previously mentioned, I played around with QjackCtl settings, and it appears to have helped some; there was nothing scientific. For example, I changed the sample rate from 48000 to 41000 and then back to 48000, changed period/buffer from 2-3, and changed Frames/Period... and then finally resaved. I'm considering wiping out the profile and starting from new.

If you have any recommendations, I would gladly welcome them.

Many, many thank yous!