I'm not sure about the changes to the SOLO section; it reads like the game becomes a one-on-one GM'd game during a player's solo, instead of a distributed GM game.
One of the issues I see here is that some players might refuse the Follow role, leaving it in the hands of a single player each time, even if that player doesn't really want to become the unofficial Bandleader.
Also, I can see the Backing Band players just sitting back and watching, instead of interacting with the Solo and Follow.
Combining the Follow and Backing Band roles into one role might work better to keep everyone interacting with the narrative.
Finally, I think the note at the end of the chapter about rolling more than once during a solo would be more useful in the Tension section, indicating that rolls can happen, but to ignore the +Hold options (if that's the intent).
Have I mentioned that I really like this game? :)