Cubase Control Room Audio Preview question

[fese]

Hi,

so Cubase (6.5) control room seems nice, what i'd like to have is a simple setup where I have my main out and a phone channel (e.g. with TBs Isone). So far so good, not terribly hard to set up and quite useful as I cannot forget to remove Isone from the master when bouncing...
Problem is, whenever I use the audio playback tool (i don't know whether it is called like that in the english version, that little loudspeaker symbol in the tools), I can have it routed to the main out or to the phones according to the control room setting in the preferences, but not both. That isn't helpful.
Anyone knows whether I can have the preview signal, as it is seemingly called, on both channels? Haven't found anything helpful in the manual.

Thanks!