To the best of my knowledge it is not possible to record the midi from the NI Session Guitar engine.

The Session guitar series, (with the exception of Electric Mint [the latest]) is a pattern player (unless in 'melody' mode) and the patterns are played inside the script; as such, the actual notes played are not exposed to any midi out channel to be sent back to the DAW for recording.

Of course, some VSTi pattern players do permit this but at this time to the best of my knowledge not the NI Session Guitar series.

But that is just my best guess...

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