Check the connection page of your manuals, it should be right there.

thanks mate,
i seem to have it running ok, its just one of the sound guys i work with thinks its a wrong way to set it up, indicating that there is a potential for real problems. so far he has given no real reason for this and i have no trouble with recording any amount of tracks.
cheers for the reply i will just keep it as i have it set up.

There are several things to consider when using the Soundcraft GB series for recording. Firstly, it's designed as a live sound desk and not a recording/mixing desk. There are no tape return inputs and no in-line facilities on the mono channels for monitoring the returns from the recorder. With the wider members of the series, it's feasible to set up side-by-side monitoring, but the desk is really not that convenient for this.

That said, the GB series is fitted with impedance-balanced direct outs per channel (at 0dBu nominal, +20dBuFS), so the expected recording route is via these outputs. Recording the raw mono channels should not present a problem. Use TRS looms for connecting the mixer's direct outputs to the line inputs of your computer interface.

The difficulty comes in what to do with the replay outputs from the recorder (computer interface). If you take them to the TRS line inputs, according to the block diagram, these are resistively mixed with the XLR mic inputs including applying phantom power to the line inputs. So there is not only the danger of damaging the recorder's outputs, but also of creating a feedback loop. If the block diagram is correct and is not a misleading over-simplification, this desk is really unsuited to mixdown applications, and you should be thinking solely in terms of ITB mixing.

As Boswell described, PA desks have inherent problems when used as recording tasks. Most notably is lack of console mode switching. If your recorder happens to be on input monitor, and you plug the output of the recorder to the line input of the PA desk, you will most certainly scare the crap out of every cat, dog, bird, bee & all humans providing that your speaker system survives such an attack. This is a big problem with a lot of home studios as we are frequently feeding direct outputs into the multitrack. The multitrack then feeds the input back again. You'll also kill everyone's hearing if anybody has headphones on. It's always fun to watch them jump. Makes for great laughs in the control room.

I always want others feedback just not my own
Mx. Remy Ann David