Thanks for the reply, Joey. I've got specific questions about the setup in Logic, so I guess I'm looking for a tutorial.
The manual answers these questions only very briefly, it can't cover all the DAWs on the market, I fully understand that.
If I manage to find out by myelf, I might come up with a tut to tell the world!

Hi,

maybe there's an experienced user among you guys who could help me.
The USB issue is still a riddle to me - as I'm a newbie to my DAW (which is Logic 9) there are still sooooo many secrets.
Can my VoiceLive 2 actually be used as an insert without any other cables? Just the good old USB-cable? I've got a fire wire interface (Saffire Pro 24 DSP ) with a decent mic preamp to record my vocals into Logic. The VoiceLive however is connected directly to my mac, not to the interface (no USB here, of course).
I'm aware that the VoiceLive won't actually be shown as a AU-Plugin, so there's no access to it below "Inserts", allright?
In the Logic Audio Options the interface is chosen as the input- and output-device. Is that correct or do I have to choose the VoiceLive as input??
One audio track in Logic contains the vocals, no processing so far. In the channel strip of the vocals I chose a bus (below "Sends"), which also caused a new Aux-Channel to appear. Another track contains MIDI-notes that could be used to control the harmonies.
How do I proceed from here? I might not have fully understood what a bus does besides linking several tracks to the same effects.
I'd appreciate any help from someone who has actually managed that setup in Logic!
Thanks!