Cool. I use them 2.

Why? What r U trying 2 solve?

GTR > amp > mic> mic pre amp > compressor > +4 input in the A/D converter.

-or-

GTR > amp simulator (Pod, shmod etc. o/p @ +4 dbm)>RNC> A/D input.

-or-

GTR > DI > mic pre amp > converter input @ +4.

Natürlich: The operating levels do not match. The gtr's o/p operates @ instrument level, and the RNC operates @ pro LINE level (0 dbu)

...2 b expected...

Right.

The RNC did get it, but @ very low level, so the signal was amplified @ the mixer along with the background noise.

U haven't mentioned which amp model U're using.
Mental note regarding audio levels:

Passive instruments such as an EL GTR produce very low levels reffered 2 as instrument level. 2 b handeled by studio equipment it needs 2 b amplified by the gtr amp in case of micing the cabinet, or a pre-amp in the case of direct injection (DI).

Consumer equipment ( a portable or home cd player 4 x.) produce higher levels. These r often reffered 2 as -10dbu - consumer level.

In the studio we use even higher elevated level standards 2 keep the signal clean and dynamic. These connections will often b marked as +4 db(m) and dubbed line level.

Most amps' FX loop sends r designed ASSUMING the loop effect is a stomp pedal, and those r designed ASSUMING instrument level.

The RNC is designed 4 LINE level i/o, so the signal from the FX loop send should b amplified 2 line level B4 it reaches the comp.

Some amp models however take rich clients in2 account, and the direct o/p or FX loop sends may b switched 2 line level by dedicated sockets, selectors or knobs on the back panel.

A compressor may b strapped in many configurations, including the FX loop, but U better explain what is it that U r trying 2 accomplish.

The RNC's natural place is @ the mixer's insert point (it even offers an insert socket 4 a Y type cable), or between the mixer and the converter, so if U have anything else in mind better make it clearer 4 us bozos 2 understand.

U're welcome.


Peace,

Zooot