Mastering Tutorials !!!

"The LinMB is an evolved version of the C4 MultiBand Parametric Processor. If
you are familiar with C4 you will find the Linear Phase MultiBand very similar,
adding some true breakthrough innovation and technology that yields superior
and purer results.
The LinMB has -
5 discrete bands each with its own gain and dynamics for equalizing,
compressing, expanding or limiting each band separately.
• Linear Phase crossovers allow true transparency when the split is active
but idle. The only effect is pure delay with no coloration of any sort.
• LinMB is equipped with the options for Automatic Makeup and gain Trim.
• Adaptive threshold behavior achieves most effective and transparent
multiband dynamics processing.
• LinMB has the visual interface of the award winning C4 with Waves’
unique DynamicLine™ display showing the actual gain change as an EQ
graph display.
Waves created the LinMB to answer to the most demanding and critical
requirements when Mastering any sound and genre of music."

Basically, it's the same function, but it has more options and generally sounds better. It's much more CPU intensive too. I don't find I need the options the LinMB provides on say a guitar track or a bass track, so I'll just use the C4. But if you're going to be running your whole mix through it, it's a better choice (IMO).