4. The Less the Better
Always use less reverb than you think is necessary. Generally, reverb should have a more subconscious psycho-acoustic effect than an obvious audible effect.
Of course, there are situations where you're using reverb as a creative effect. In this case, adjust the effect to your liking. However, if you're just using a general room reverb on your mix to add depth, then the effect should be kept subtle.
5. Use Subtle Reverb On Your Delay Sends
This is another reason to use effects on busses.
In some cases, you might use delay instead of reverb to add space. However, "bare" delay may sound unnatural sitting back in the mix.
The best solution is to apply a bit of reverb on the track with delay.
6. Use Pre-Delay
Use pre-delay if you're adding reverb to something that you want to stay up front in the mix.
For example, try using a 60ms pre-delay on a vocal. That will move the reverb back a bit, so that the initial attack of the vocal doesn't have any reverb on it.
The effect starts sixty milliseconds later. This is a very small period of time, but since the attack and the onset won't immediately have reverb, this will help it to cut through the mix a bit more.
You can do the same with guitars or anything else where you want to add reverb to create a sense of space, but where you don't necessarily want to put it further away.
7. Experiment With EQ
This is another big reason to use your reverb on the same channel – the option of adding treatment after the reverb. In most cases this is an EQ.
You can cut the bottom end, you can remove some of the mud around the low mids, and you can fix the frequency conflicts between the original sound and its reverb. This can have quite a big impact on how the reverb sits in the mix.
A lot of reverb plugins have EQs built in that you can adjust, but sometimes it's nicer just to load up more flexible EQ after the reverb. You can clearly see what's going on, and it's much easier to control the sound of the reverb.
Hopefully this article will help bring your mixes to a new level. After all, improperly tuned reverb is the first thing that arrests one's attention regarding the mix of inexperienced producers and sound engineers.