3. Pre-delay for clarity
Fashion is changeable, including the fashion for music sound. So, for already many years mixing mastering engineers have preferred extremely clear and open vocal sound by avoiding reverberation in audio spatial processing. Recently the fashion for reverberation during vocals mixing and mastering has come back whereas the requirements for the clarity of overall music sound don’t disappear anywhere. The matter is that according to common recognition of audio engineers, the reverberation on vocals enriches audio's sound though, nevertheless, puts it to the background considerably what of course violates the concept of vocal sound “just in face” which has long been popular. Experienced audio mixing engineers solve this issue easily with pre-delay – the setting built practically in each reverberator. It means that the reverberation tail will follow after a clear signal with a certain delay. Therefore, the engineer can considerably split dry and processed signals over time by leaving vocals still clear and in the foreground but with rich spatial processing without clouding it.
4. Annoying sibilants
It’s impossible to achieve ideal vocal mixing without appropriate sibilant processing. This is the nature of these sounds filled with the multitude of high frequency harmonics. They possess large energy so mixing services engineers practically have no chances to get clear music sound by ignoring them. The easiest way to clean out vocals from them is the use of de-essers plugins or a multiband compressor during mixing. You can also trace the outlines of loudness automation manually but this approach requires too much time.