I've found that with a little creative cutting and pasting and Guitar Rig I can make usable distinctive solos from what's available for just about everything I've written.
Don't forget that the RealTracks will be a little different each time they are loaded.
Save several of these tracks and you can find passages that can be strung together to compliment your arrangement. I've even used acoustic Jazz passages run through Guitar Rig in my country stuff, and I've used combinations of Blues, Blugrass and the Metal soloists within the same track, with a little EQing and effects it can be quite interesting

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