See data sheet or other notices.

UTILIZATION

It could not be more simple: gain, output, phantom power ... double connector jack + XLR ...

SOUND QUALITY

Not much to say. In my opinion, people who said c'tait not usable in the studio did not know how to use it. And is like a bad relationship quality price, you really have to know a turning knob.
The problem of this product is the lack of graduation "pro" (which I need), ie a scale in dB. It is not known o is 0 dB both in or out, which is trs prjudiciable, Obviously it's like driving a car without knowing when you brake or when you access Lérez but you have to use your two pedals at the same time. If your gain is -10 dB and put your output level 10 dB when you brake and you acclrez at the same time, except that you do not even know!
Feedback, a risk of blows comes as a signal / noise ratio can be optimized not really "eye".
Otherwise, if you put everything back is that sr has breath, but must see the level coming out too ...

OVERALL OPINION

I bought it was released, it cost 950 F or more than double its current price, and I do not regret my purchase. I rcemment used a cello, a coupled Audio-Technica ATM-33 (an electret, I think, can walk on battery or power supply) and frankly I got a nice sound without breath .
The absence of saw-Maître makes using a bit difficult, it is true, but hey, it's a far Exceeds prampli that you find out about his style machines Portastudio and Roland VS ... (I have a VS-1680) ... it's the use, right?

For low-volume sources such as acoustic guitar arpge, for example, I recommend a pramp quieter, but you pay bcp bcp more.
At the current price of about 60, is unbeatable. Probably much better than the Behringer ...