Paul Frindle has forgotten more about digital audio than I will ever know. His decades of experience have made the truly unique DSM into one of those essential "Desert Island Plugins" that I have to have.
This has been a secret weapon of mine for note-by-note consistency on bass and frequency aligning vocals for a few years. It is utterly unique and quite often life saving.
This is one of the best multi-band compressors I have come across. It deals with phase issues, which makes it worth its weight in gold.
Dynamic Spectrum Mapper was first shown to me by Seth Drake and I use it every time I need to get a new track ready to play out. It allows you to copy the dynamic spectrum from one track and apply it to another. This means I can match a new song to all of my other tracks.
BOOM! "In your face," big, clear, airy vocals, instantly. I've used various enhancers over the years, both hardware and software, but this immediately gives me what I want to hear within a few tweaks.