Each patch may send only to 1 output (or 2 outs when stereo), however, here are some ideas for you:
-You can select, say,output "Out1 L+R" and link the L to the amp and the R to the recording device, however, both outputs will be mono.
Even better:
-Out1 L+R sends a copy of the signal via SPDIF, so you can link for example the analogue outs to the amp and the SPDIF to the recording device. As a side note another copy of the Out1 of the signal goes out via the headphones port but I don't know if the sound quality is sufficient for recording purposes
Another idea:
-Usually audio interfaces allow you to send a copy of an input elsewhere by messing around with routing options, provided of course your audio interface supports routing possibilities
Edit one - this just hit me:
-You may also use the surround out in the config page to set your secondary out , then set the balance of the 2 out options in the common section.
Hope this helps!