I would have thought this would be a pretty necessary function that merely requires an 'enable' button as well as a 'solo' button. I mean, sometimes I might have 11 tracks solo'd, but then want to quickly listen to just one. To keep muting the other tracks is just unnecessarily tedius.
I don't really see it that way. 'Solo' doesn't say 11 tracks to me - one or two is sufficient. If your tracks are grouped sensibly I can't see why you'd want 11 tracks individually soloed.
An Eagle for an Emperor, A Kestrel for a Knave.