I often use a SGU that only contains the chords for the solo. I add a half measure before the solo to try and get a few good pickup notes into the solo. After generating three or four that sound acceptable I’ll move them to Logic Pro X for comping if necessary and ultimately mixing.

And I sometimes use Logic’s pitch editor to change the final solo note that segues into the vocal or another instrument if it’s a split solo. And being nothing but an old average bass player I’ll consult with a soloist friend for an opinion on the solo and in particular the note that resolves the solo.

FWIW

Bud

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