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If you receive very dry stems sometimes you’ll want to use specialty reverb on particular parts. Most commonly this “specialty” use of reverb will be applied to vocals, snares, lead guitars, pianos, and synthesizers. Again, it’s really important you use your ears and determine what’s appropriate.
In theory this usage of reverb isn’t that much different from what we discussed during the production stage but be careful to not overdo especially if you’re stems already have reverb applied to them If you want to go for a washed out effect (lots of reverb) by all means do it.
If you’re looking to add a sense of space or depth you may not need to use reverb (by it’s technical definition) at all. Using early reflections, short delays, and processed delays will all work to add a sense of space without potentially washing things out. Again, use your ear and do what you think sounds best.
KResearch - KR-Reverb FS
Voxengo - Old Skool Verb