Choice of pre amp and compressor emulation is not something which can be dictated but is down to taste, style of track, choice of mic and may other variables. Your ears which will tell you what works and what does not. You may find a particular pre amp works really well on a guitar that you often record but someone else may disagree with the choice of pre amp or compressor. Neither person is correct since different things can sound good to different people - what sounds good to you will dictate how you use the unit and what emulations you choose, therefore we feel it is not appropriate to give instructions on what emulations should be used where.
It is a good idea to get used to the range of sounds that the Liquid Channel offers, though if you are not familiar with the gear it emulationtes then it will be difficult to discover and remember the sonic characteristics of each emulation. We suggest comparing the following emulations as a starting point to getting to know the unit a bit better:
US 60'S TUBE 1
US CLASSIC DISCRETE 1
DEUTSCH 60'S TUBE 1
US VINTAGE TUBE 1
BRIT 70'S CLASS A 1
US MODERN SOLID STATE 1A
NOTE: these are the factory emulation V2.0 names. You can find out the original units that the emulations were created from on the emulation list.
Click here to visit a good site which lists some useful info about lots of classic compressors including many of those emulationted by the Liquid Channel.