As was said above, get it right going in and you have zero problems come mix time.
This is fine when you're recording with microphones, but a lot of "recording" these days is done either by recording midi into a vsti or composing in the track/staff views.
You have to take each case as it comes. If you're happy with the dynamic variations you've applied to your midi sequencing and the levels are too hot, go into the vsti and reduce the level there (the alternative is to use the Gain control at the top of each track (in console view) or via the same control in the Track Header in Track View.
Some synths put out a HUGE volume which clips immediately if left at the default - like BFD for example.
I always start by going into the BFD mixer and reduce every fader by at least 9dB