What to do if you need to fix it in the mix?

It happens, anyone can be responsible for making a mistake or two in the final mix. It sucks, but there are ways to fix or tweak the mix once a mistake is laid in. Try Eq-ing your drums or adding sub-bass to create an artificial low-end thump. If worst comes to worst, you can always re-record, but it’s always nice to save time if you can

What to do if you need to fix it in the mix?