Themis wrote:
> So, an "Audio Buffer" is a preamp without a volume control, right ? 
> Did I get it properly ?

Not quite.

As usual, wikipedia has a useful entry:

http://en.wikipedia.org/wiki/Buffer_amplifier

> In such a case, if you already have a preamp (or an integrated amp)
> what could possibly be the advantage of putting a second preamp in the
> circuit ?

As DCtoDaylight has already said, if you have a source with a high 
output impedance and an amplifier with a low input impedance then a good 
buffer can improve things.

R.

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