A common scenario with this kind of summed mix would be to only add a little air/reverberation and then begin to master the summed tracks. Also keep in mind that each track that contains its own reverberation will “appear” to effect lower registry instruments that have no reverberation effect applied to their track effect chain during playback. This might be enough to pass on further effect chain additions for the track, if it doesn’t sound detectable. Keeping bass frequencies more natural tightens the mix and helps to compliment the tracks that are using “space” enhancing delays or reverberation effects. A touch of natural space enhancement at the master channel effects bin can even out the individual effect chains on each track, but too much of anything here can destroy an otherwise acceptable mix. Always think as conservatively as possible when applying effects to the master channel if you are attempting to enhance a natural sounding mix of audio program material from the individual tracks.
If your track capture contains fewer effect chains and a large overall sound is desired you can sum the tracks at the master channel and, for example, add a long reverberation effect at around 20% into the dry signal from the tracks. This will create a space for the entire mix instead of giving individual track signal the effect. It will sound as if the entire audio program was captured inside of a church or arena. You should still be conservative here depending on how you want the summed tracks to sound. Enough dry signal summed with the reverberation effect signal will produce a believable audio environment for the listener while retaining a lot of the original and natural sounding performance capture.
Alternatively you can assign groups to 2 or more tracks at a time and only apply effect chains to groups of tracks that are members of their respective groups. This is the most common technique for large orchestrations or projects that contain higher numbers of tracks. Applications can depend on whether the audio material will be used in a movie soundtrack or as a release from a band.