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Thanks for your help. I've made a tgz file of a Qtractor session with recorded midi file and with several recordings of the midi file, via linuxsynth, linuxsampler, and Pianoteq at this location:
http://www-personal.umich.edu/~diehl/miditest.tgz (too big to upload here)

I've also included the midi file and wave file made directly by Pianoteq of the same recording. That is, I recorded simultaneously with Qtractor and Pianoteq.

The recordings made of the Qtractor midi file with linuxsynth/sampler play back nromally (except each has a few
glitches, which is another story - probably I should record with a higher latency)

The recording made with Qtractor/Pianoteq is stuttered and stacatto-like.

However, the recording made directly with Pianoteq plays correctly.

I've decided that perhaps Pianoteq and Qtractor speak different dialects of midi. You can load/play back a Pianoteq midi file in Qtractor and it works fine. However, playing a Qtractor midi file into Pianoteq (or loading a Qtractor piano file directly into Pianoteq) results in the stuttered play back in Pianoteq.

By the way, you can download a free trial version of Pianoteq which functions normally except for a few missing notes, and a 20 minute timeout.

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