[BScout]

Then you solo safe the tracks feeding the auxes. Command + click (Mac) /Ctrl + click (WIN) on the solo button. Then when you solo an aux you hear everything going into that aux.

This is what you have to do to Solo In Place through your bussing chain anyway (AFL/PFL divert as was mentioned.) Not a big deal.

(btw, if you want to find quickly all the tracks that feed an aux, you can use bus interrogation: right click on the output of an audio track that uses that bus or the input of the aux and do a select or show only and you'll only see the tracks that feed that bus. You can do a restore if you do "show only" after)